i started sleep schedule from nb, occasionally when go out will sleep late but will usually take a few days to go back to the normal schedule. i’ll usually try to not to let him sleep when it’s gonna be his sleeping time
my 9 mos baby sleep at 10 or 11pm if we go out woke up 8:00 am in the morning, but in between he will roll here and there or sit up due to his teething other than that he is ok
My 11mo baby slp at 7pm++ to next day 7am++ You need to re-organise ur child sleep schedule, have a bedtime routine, have a good sleeping environment (blackout room).
my 28 mths start sleeping from 10pm to 7-8am since 10 mths old.. no milk in btw... gonna be more firm in making your bb sleep at certain timing