Sleeping Habits

Hi mommies, I have a 7 month old boy and I obsrerved that he keeps on sleeping. Before he sleeps at 9pm or later now he sleeps at 5pm until the next day btw wakes up to drink milk within 5pm to 6am maybe 3 times. Is this normal? TIA #firstbaby #pleasehelp #1stimemom #advicepls