Hello ? We're getting up with our daughter in the morning. I feed her…

Hello ? We're getting up with our daughter in the morning. I feed her lying down and we both fall asleep well. Kids are just made to sleep together like this ? But here's my question: can you tell if a child has eaten enough by feeling their breast? When I lie down with her, I immediately fall asleep. I don't watch how much she eats. We can sleep for 3-5 hours, waking up and falling back asleep. I think she doesn't take a good hold of the breast lying down and it pops out. Could a baby not eat enough because of that?