Baby got out

Two weeks ago my chin had a baby, she hasn’t had one in about 5 yearss and never with this male so I was shocked when she had a single kit. I thought the cage was pretty baby proof but somehow he got out while I was at work and I have tore my house apart looking for him to no avail. ☹️ Guess my question is how long could he survive without moms milk/warmth? As I mentioned I was at work so not sure exactly how long he has been out but I’ve been home for almost 4 hours looking for him and haven’t found him ☹️ Is there a possibility he could be alive? Sucks so bad, I feel terrible