Baby and sleep

Help! I understand that all babies are different but I’m so stressed. At what age should your baby be able to lay in the crib and fall asleep on their own? And at what age should they be able to start sleeping through most of the night? My 6 month old still doesn’t sleep unless you’re holding him and still wakes up between 4 and 6 times a night. My husband helps some but he is being deployed in 3 months and it’s just going to be me and the baby. SOS Send help!