Background: With the increase in the use of assisted reproductive techniques thanks to the studies and developing technology in recent years, a significant increase has been observed in multiple pregnancy rates. Studies conducted in the world and in our country have stated that the twin birth rate is between 1.86-10.9%. With the increase in twin pregnancies evaluated in the risky pregnancy group, the responsibilities of healthcare professionals on issues such as regular follow-up in both antenatal and postnatal periods, ensuring successful breastfeeding, and care of babies have increased.

Breast milk is the most appropriate and valuable food source for multiple babies like single babies. Although there is strong evidence about the benefits of breast milk, it has been emphasized in studies that the rate and duration of breastfeeding in twin babies are low and not at the desired level compared to single babies. Although there are many factors affecting these rates, the most important one is the mother's decision and intention to breastfeed her babies during pregnancy. During the mother's pregnancy; The feeling of uncertainty and inadequacy about birth, feeding and care of the baby causes loss of trust in the mother and results in unwanted experiences by affecting her motivation.This situation can be further complicated by the thought of being a twin mother. Therefore, the continuation of breastfeeding training that started before birth in the postnatal period in line with the needs of the mothers, and individualized breastfeeding support have an important role in the initiation and maintenance of successful breastfeeding.

Today, it is recommended to use different materials and techniques in order to ensure continuity in the training given to healthy and sick individuals. One of them is QR code supported training. Quick Response (QR) codes, which act as a bridge between old and new educational materials, make the learning process more permanent with visual materials by providing instant access to different media applications such as audio, image and video, beyond reading texts and reading the resources at any time. For this reason, QR Codes increase the effectiveness of the training by giving booklets during the education of expectant mothers, as well as satisfying the participants who are interested in traditional learning methods, while at the same time increasing the effectiveness of the learned theoretical knowledge to be practiced by following it practically at the desired time and place. QR codes also for organizations in developing countries such as Turkey have limited resources available can be integrated easily because it requires high cost and user-provided printed materials instantly accessible. QR codes, which are integrated into the booklet used in neonatal care education, because they require theory and skills, facilitate access to videos and enable the acquisition and adoption of many care practices with the interaction of image, sound and movement supported by mobile applications. In addition, considering the rapid increase in the use of smart phones today, mobile applications have a significant effect in improving health in order to increase the quality of health services. The cost-effectiveness of mobile applications, enabling individuals to learn whenever they want and appropriate for themselves without limitation of time and space, allowing individuals to follow-up and training at any time and being accessible make these applications more attractive.

In this extraordinary period in which we have experienced the COVID-19 pandemic, which has deeply affected the world recently, the need to review health education methods, especially for vulnerable groups such as pregnant women, has arisen due to the risk of hospital environments. This method we offer will be effective in ensuring safe health education and continuity. The QR Code application can also be used by integrating into different healthy / sick individual trainings, thus reducing the workload of healthcare professionals.

In the light of this information; The study was planned to determine the effect of QR code supported online breastfeeding training given to pregnant women expecting twins on breastfeeding intention and feeding with breast milk in the first six months.

Method: This research is a randomized controlled experimental study. The sample of the study will be visited between the dates of 01.02.2021-01.02.2022 to the pregnant outpatient clinics of the Sakarya Maternity and Children's Hospital Campus of the Ministry of Health Sakarya University Training and Research Hospital. It will create twin pregnancies between the week of gestation. Power analysis was performed using the G \* Power (v3.1.7) program to determine the sample size. When it is not known how many units of difference between groups are important, the effect width value is taken as 0.70 as the method used. The effect width value is 0.20 very high, 0.50 medium level, and 0.80 gives the results under the maximum acceptance constraint. It means that the higher the power of the study, the more precise the measurement is in finding the difference. Power is expected to be 0.80 and above. However, some experts emphasize that this limit is between 0.70 and 0.90. The study was planned with a total of 102 pregnant women, 34 babies for each group, when the probability of type 1 error (α) was 0.05 (95% confidence level), 80% power level and the effect width value was 0.70. A total of 102 pregnant women that make up the sample in the study will be randomly divided into three groups. Pregnant women to be assigned to the groups will be assigned through a computer-based random number generator program.

The sample of the study will randomly allocated into three groups: online training for intervention group-1, online training with QR code support for intervention group-2 and the other group, which was the control group, routine health monitoring of the hospital and will be followed in line with their information. Since the education about twin babies breastfeeding will be given by the researchers, single-blind randomization will be provided. The statistician also will be made blind for the data analysis purpose. In data collection tools, "Descriptive Information Form" containing sociodemographic characteristics of the family, "Breastfeeding Intention Scale in Pregnant Women Expecting Twin Babies" to measure the breastfeeding intention of pregnant women who are expecting twin babies, and the babies created by researchers to monitor breastfeeding status in the postnatal period. will be collected using the "Breastfeeding Follow-up Chart", which includes birth histories, hospital stays and breastfeeding processes.

The first stage of the study includes the training and filling out the "Introductory Information Form" and the Breastfeeding Intention Scale for Pregnant Women Expecting Twin Babies "before the training. The training to be given to the experimental groups (intervention 1: Online training group, intervention - 2: Online training group with QR code support) will be carried out online and remotely. Training on successful breastfeeding in twin babies will be carried out in two sessions at a time. Powerpoint presentation, simultaneous breastfeeding animations for twin babies, breastfeeding guide will be used as educational materials. In addition, QR codes will be integrated into the guide in order to provide the opportunity to watch the video simultaneously while reading the guide in situations that require knowledge and skills related to breastfeeding and to allowed them to watch repeatedly as long as they feel the need. QR Codes for Videos on Breastfeeding Training in Twin Pregnants will only be used in the intervention - 2: QR supported Online training group. The training will take approximately 1.5 hours on average. After the training, the questions of the pregnant women will be answered. Before the pregnant women leave the training, breastfeeding guide will be sent to the intervention 1 group, and the training guide with QR code to the intervention 2 group will be sent to the e-mails of the pregnant women. The pregnant women in the Intervention 2 group will be periodically sent reminder notifications to watch the videos before and after the birth via the QR Codes in the guide. No intervention will be made to the control group. The second phase of the study includes the postnatal breastfeeding follow-up of pregnant women. At this stage, the pregnant women will be called every month starting from the 1st month to the 6th month in the first week after giving birth, and the nutritional status of the babies in the first 6 months will be followed by using the "Breastfeeding Follow-up Chart" form. In the evaluation of data, statistical analysis will be performed using the SPSS package program. The Kolmogorov-Smirnov (K-S) test will be used for normality. In order to determine whether there is a difference in the dependent variables compared to independent variables, the independent group t-test will be used if the distribution is normal in independent variables with two options, and Mann Whitney-U test will be used if distribution is not normal. The results will be evaluated at a confidence level of 95% and at a level of significance of p \<0.05.