Ree
Depends on the swing. Go to their web site, their should have the specs on there!

blondie
i think most are about 40 lbs...i say it is once they are too big to get in or out or if it is one that sits low to the ground, once their butt starts to drag! lol!

lysistrata411
I have a graco and it's max weight is 25 pounds.

eeyorechick101
My graco swing is up to 25 pounds. Check out your manufacturer website.

joan r
I worked in a nursery and even a 2 year old could sit in them.