Yeah I started my family as one young adult and her two toddlers and they all live in the fairy bungalow together. Toddlers incredibly autonomous! If they wake up before mum they can just get up and go play together, if they're hungry they can feed themselves. It's amazing.
I'm fairly sure this won't work for babies though - I should find out soon since the girl of the twins did Try For Baby in the arboretum with her romantic interest, but I'm expecting to be placing a crib until the baby becomes a toddler (assuming she did get pregnant, that is).