Two questions: 1.) Should I hold my kid back from attending Pre K or K if they are not 100% potty trained? 2.) Do children with birthdays early in the year (Jan, Feb, March) have an advantage over children with birthdays in the last 3-5 months of the year when it comes to school? And has anyone held their child back from Kindergarten in order for them to be academically matched or on par with the other kids? I'm all new to this stuff.