For a 4 months old baby, i'd say that he is no trouble at all with his sleeping way. My children all wanted breastmilk whenever they nap/sleep!
I suggest you be patient and follow the flow. I mean, your baby is still young, already spent whole 9months in ur tummy, very2 close to you and now you are rushing him to be independent. Give him some time. Personally i think at age 6 months above, your baby will start exploring the world and be less independent so you can start bedtime routines too to help him sleep through the night. Good luck!
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