at about 6 weeks old, then it gradually diminishes.
My baby girl is 5 weeks old now. She has gas/reflux after feeding, screaming more.
But after midnight she's too tired and fall sleep.She sleeps through the night, till 5:30-6:00am. Then we start a new day of changing diaper, feeding, screaming, full cycle all over again.
All baby has a similar period of crying spell, I guess, if not colic
