Inclusion Criteria:  Participants cannot be enrolled before all inclusion criteria are confirmed.  Female participants with an ability to voluntarily provide verbal followed by written, signed, and dated (personally or via a legally authorized representative) informed consent as applicable to participate in the study. Healthy female participants as determined by the investigator on the basis of enrollment evaluations. Participants greater than or equal to (>=) 18 years of age at the time of consent. This inclusion criterion will only be assessed at the time of enrollment. Participants who are currently breastfeeding a singleton infant who is between 10 days and 11 months 0 days. Participants who are currently exclusively breastfeeding or breastfeeding with supplemental formula and/or solid food. Infants who are exclusively breastfed and do not eat solid food are preferred. Participants who are currently treated as prescribed by their physician with prucalopride for functional constipation for at least 5 consecutive days at the time of taking the first breastmilk sample. All recommendations in the United States Prescribing Information (US PI) should be followed. Participants who agree to the conditions and requirements of the study including the sample collection, interview schedule, completion of developmental questionnaires, and release of medical records. Participants with an understanding, ability, and willingness to fully comply with study procedures and restrictions.  Exclusion Criteria:  The participant will be excluded from the study if any of the following exclusion criteria are met:  Participants who are breastfeeding an infant who: is hospitalized, has a major birth defect, or has a history of a disease that could affect absorption or drug disposition. Participants who have used prucalopride while breastfeeding for a condition other than functional constipation. Participants who are pregnant at the time of enrollment. Participants who have started to wean their child from breast milk. Participants with a history of any hematological, hepatic, respiratory, cardiovascular, renal, gall bladder removal, or other current or recurrent disease that could affect the action, absorption, or disposition of prucalopride.