MnMztama495: Toddlers can die, but babies can't. If you leave them alone, though, they will probably die very soon.
To show you how hardy a tama can be, my debugged V2 died, but it chose a male baby before I could choose the character. So, I decided to get rid of it. I fast-forwarded it until it evolved into Child Stage, and then I tried to get it to die. It turned into Nikatchi without being fed once.
You should be pretty safe, as long as your tama has 3 hearts (V1-4.5) or 4 hearts (V5) or more.