honestly, babies are so sketchy at that age when it comes to sleep. i'd say it took us until our son was 3-4 months old before we got him on any kind of sleep schedule. is he waking up in pain and hard to console, or is he just waking up and either eating or just wanting to hang out? if he's waking more to eat he could be going through a growth spurt (they do that a lot the first few months). if he's just waking up to hang out then it could just be him going through a change in sleep cycles. like i said, it's too early to do sleep training now so as long as he seems in good spirits and nothing seems off in terms of eating or output (wet and dirty diapers) i think you'll just have to roll with it. just because he was sleeping through the night three days ago doesn't mean he won't do a 180 degree turn for the next few days and wake at all hours. the joy of infants, eh? :) hope he gets himself back on a good schedule so you can get back to getting some rest! good luck!
I'm not sure if your baby is breastfed or formula fed, but when my son was a newborn he was waking up every 45 minutes. He was breastfed at the time and I started thinking he wasn't getting enough to eat. I pumped an 8oz bottle and that solved the problem. He started sleeping a lot longer, both of us did! If he is formula fed, then I guess it could be anything. My son never slept good in a bassinet or pack n play either. He always slept the best in his crib; I just think the crib mattress is more comfortable. Good luck!
It could be anything, or everything. Growth spurt, developmental milestone, gas... It will pass. I know it stinks right now, but it gets better.
My son does the same thing and he is 16 weeks old.. I dont know the answer nor am I going to pretend that I do. with my son when he gets like this its because he is either still hungry because he didnt finish his bottle, cranky because he is tired and just cant go to sleep on his own, or he wants to be held for a little while.. what have you already tried?
Hope this has gotten better for you. I went through the same thing around 5 months. He got way off track. Around July, I started making sure he got wind down time. I started walking with him in his soft carrier before bedtime and he started sleeping much better. He went from waking 6-8x/night to 2.