Hello, the baby is sleeping very little or I think so already 4 days h…

Hello, the baby is sleeping very little or I think so already 4 days he sleeps at least 6 hours, this is even in the night, waking up in the morning at 5-6 o'clock. He wakes up in the day and doesn't fall asleep at all. He used to sleep very well both during the day and at night, is that normal for a 6-month-old child?