Some thoughts about the situation in the game
How will the baby survive now? You can't feed normal or survival food to a newborn (or that I think). And it's been a pretty long time since the people eating eachother thing started, so resources as special as baby food aren't going to be exactly easy to find.
Rebecca was supposed to breastfeed him but what now?
Also I have this thought about now Christa somehow having the perfect chance to appear in the 5th episode and take now deceased Rebecca's place as a mother, therefore having her second chance of raising a child since the beggining.
Then again I had this very random thought about everyone getting killed in the shootout, except the baby, who's found shortly after by Christa, who's on her way to North Wellington, so she takes the baby, and we get to play the next episode as her getting to North Wellington, so the next season we'll play as her with the uneasy task of raising a child in the apocalypse, which is a new, maybe interesting concept, yet with a known character.