However, I think it is important to also consider the impact on the child who may be unnecessarily held back. Communication with your children's teachers is going to help you make the best decision. Since you have already talked with one of them about retention, you may want to talk to the other one, too. Find out from the teacher just where your child is at both socially and academically. Perhaps retention would be beneficial for him, too.
Retention can be ineffective for some children.
Younger, less mature children, can benefit from an extra year in kindergarten, but older, more mature children will not flourish if they stay behind their peers. Because your children have some special speech and language needs, you may want to discuss the possibility of retention with their speech and language therapist. They may need an additional year of kindergarten to further develop their communication skills. The final decision rests with you. Gather as much information as you can about your sons' academic, social and emotional progress this year.