I don't think so, but wow! But seriously I'm pretty sure there isn't a limit. Just, wow. Um, my sim got the toddler back because a notification came up that said something about a babysitter. I'm lucky too. If that hadn't come up, that toddler would have been spending the night at the park! I'm just really glad that bears didn't come with the sims 3 pets! Also, sometimes when my sim was sculpting a stone sculpture, she would keep the chisle in her hand while doing everyday things. Boy, do I feel sorry for that toddler when she taught him how to walk! I know sims can't feel pain, actually, but it just looked a little, painfull.