Some would call the first 3 months a 'fourth trimester' for babies, still trying to adapt to outside of mama.
They feel best when feeling like inside your belly. So held or wrapped feels best and put down feela worst. For now continue to work baby to sleep
as best you can. Average is 12-15 hours but for some its 10-11 hours. I favor the 'cry it out routine' but only well after 4 months.