Can I start a routine at 4.5 months?

Roxana
Guilty as charged. I am desperate lol. I ebf my daughter and she has no schedule. She does however go to bed by 10 p.m. And wakes up for good at 9.30 a.m. When she was 2.5 mo to 4 mo she would sleep for 10 hours at night without waking up. Lately she wakes up 4 or 5 times. I feel i am going back to the newborn stage. I know it is my fault, because i   Did not create a schedule, but we do the same things everyday, yet not on time. We play, read bathe, massage, tummy time but not at the same time every day. Do u think it is too late for me to start now? And would she sleep better through the noght with a schedule? I also nurse her or rock her to sleep all the time and i cant understand how some of you put the babies to sleep drowsy but awake. It seems impossible to me, she would wake up right away.
Thanks