(Spoilers All) Not sure if anyone has brought this up yet

So obviously the ending scene in last night's episode has everyone coming up with fun new theories on the Others and their society. However I want to address a question I have that I haven't seen brought up. How did this newborn survive the journey so far north in just a blanket and with what I'm assuming no food. We first see the infant as a fresh newborn and by the time the Other reaches the altar in the Lands of Always Winter the baby appears to have aged by what I'm guessing several weeks/months (never had kids, help?). Highly doubtful the Other is breastfeeding or nurturing it in any capacity. The baby hasn't died and been resurrected as far as I can tell. Not only is it alive but it appears to be rather content up until being placed on the ice altar. I know this is a trivial detail compared to the rest of the scene scene (night king?) but maybe you guys can come up with some ideas. Thanks!