my baby 4 month 20 day old , born weight a2. 650 and now 5.4 BUT she sleep continually at night no feeding

A. From a developmental perspective, babies are able to sleep through the night — defined as a six- to eight-hour stretch — without eating when they're between 4 and 6 months old. In this age range, most babies reach the 12- to 13-pound mark, the weight where they no longer metabolically need nighttime feedings.