The now born bb has not adapt to this world, they are lack of safety. Mama milk give them sense of peace, so they might not cry for hungry.
If your BB is already one mth old, you may use 安撫奶咀, they love it.
I go thru your situation as well during first 2mths, ie. maxi 12 meals/daily, each meal take 1hrs. BB eating schedule will be less and more stable very soon....