I think the baby should start sleeping at 9: 30 in the evening. Many babies are particularly difficult to coax to sleep, and some even fall asleep for more than half an hour. In other words, at night 10, the baby has entered a deep sleep state. You know, at night 10 to 2 am, the baby's auxin secretion is particularly strong and his metabolism is the most active. Therefore, as parents, we must develop the good habit of sleeping at fixed points.
As the saying goes: early to bed and early to rise. If the baby wants to go to bed at 7 pm, I estimate that he will definitely wake up at 12 am, which will not only affect the baby's growth and development, but also affect the baby's spirit when he wakes up at this time. When he puts them to sleep again, they will wake up in two or three hours at most, and sometimes they can't sleep before dawn, which seriously affects their parents' sleep. So be sure to let the children sleep at the right time, which is good for both children and adults.