Adding onto what Kuri said, Creature Features is a really nice channel for checking out IT servers and just general games like FeralHeart.
I don't know a specific game that allows you to start off as an infant but I'm sure if you search hard enough, there are plenty out there.
I can recommend Meadow (http://store.steampowered.com/app/486310/Meadow/) and The Isle. (http://store.steampowered.com/app/376210/The_Isle/) Both games you can be an infant in. Though, I personally think The Isle is more fun to be an infant in, in all honesty. Though, with The Isle, you can't start off as an infant. You can either join in a Sandbox server (be whichever dinosaur you want), or start off in Survival (work your way up the food chain). The only way you can be an infant is to be nested, if you so happen to be a lucky person to be nested by someone who has a nest. Though, the thing is, you cannot talk to anyone outside of your species as either Herbivore or Carnivore, so you cannot be asked to be nested as a specific species if you so happen to come across someone with a nest. Instead, if you get a nest invite, you'll accept and become something at random, depending on what species the nest belongs to if that makes sense. Never the less, it's always so much fun being someone's infant and surviving along side them or even in a herd.