My son is 3 days old, today is our first day home from the hospital. We stayed an extra night as he is jaundice. The nurses said it was important for him to eat lots and every 2-3 hours. He latched really well and my milk is in. Sometimes in the hospital he would nurse for 1-2 hours on and off before he’d nap. But he just ate and only ate for about 20 minutes and went back to sleep. Is there a way I know that he ate enough? I know to monitor dirty diapers but that is more of a pattern.