I'm wondering at what age an infant or toddler should be assigned their own seat. As I start to develop my seating chart, I'm wondering if my three year old niece will need her own seat or will want to sit on her mom's lap during the ceremony and reception. Am I supposed to rent high-chairs?? And what is the age cut-off for getting your own seat?? Lastly, if the child is under 1, should I give the mom an open seat next to hers to place the baby carrier so she doesn't need to hold the baby the entire evening? Thanks for the help!