I was wondering if anyone has a favorite sleep training resource.

I was also wondering if it is normal to have a night waking/feeding in the middle of the night at 4 mo? My parents say no and my friends say yes, so I wonder if it is generational, or just the ppl I know.

My LO otherwise sleeps from ~7pm-~5am. Is it normal to expect him to sleep all night at this age or am I hoping for too much??