I'm sure this is asked all the time, but how would one pull off having an infant for the flower girl or ring bearer?
I just found out that my sister is going to be having a baby

(SO excited!!). Depending on when the wedding actually takes place, the baby will be between 4 months - 8 months old. She has already proposed having the baby carted down the aisle in a wagon. I've seen this (in pictures) and don't like it.
I am thinking of just having the baby dressed in a baby tux or baby flower girl dress, to match the older flower girl / ring bearer. (FI has a niece and nephew who will each be 7 years old, plus my step-sister has 2 little boys, who will be 6 years old and 4 years old, respectively, on the big day). Haven't actually picked official flower girl / ring bearer yet. Are 7-year-olds too old for that sort of thing?
Am mostly just wondering if anyone has had an infant involved, and how they did it.