My daughter just turned a month old today. And I've noticed she's been sleeping non-stop since about 4:30PM the previous day to about 1:15AM this morning. She just woke up. Drank about an ounce of formula & drifted back to sleep. Is this normal for a newborn or should I be waking her up? Could it just be a growth spurt or something? I don't remember too much of my son's sleeping schedule when he was a newborn... so I feel I'm new to all this once again!