Sleeping through the night depends on the age of the baby and the family’s night time routine. The concept of ‘through the night’ also depends on a number of factors. Newborns need to eat every 2 -3 hours around the clock. This means that for a baby from birth to 2 months, the definition of sleeping well can mean sleeping up to 3 hours for the first 2 months. Nights and days get mixed up for newborns because they have to refuel frequently. Establishing a night time routine as early as possible helps the baby develop the distinction between night sleep and naps. As the baby reaches 2 – 4 months of age they baby can last longer between feedings and may sleep 5 to 6 hours at a stretch. At this age a baby can begin to be encouraged to sleep longer during the night by giving them a full feeding before laying them down, and not disturbing them until they wake up to eat again. It is not ever good for a baby this age to be left to cry for a long time. A little fussing is OK, and they may settle themselves down. But all out screaming means they are not going to be able to get back to sleep on their own. Babies need to know they are safe, cared for and that someone will meet their needs to develop healthy attachment. Healthy attachment lays down the brain circuitry needed for normal development in all areas. An 11 pound 4 month old can go up to 8 hours before needing to eat, if they have been giving a full feeding before laying them down but they may wake up very hungry. So, count on maybe 6 – 8 hours at this age. By 5 – 6 months most babies can go a full 8 hours without eating, especially if put to bed with a full tummy. At this age they may wake up and want attention, but they don’t necessarily need to eat. Don’t give a baby cereal in their bottle to make them sleep longer. Giving solid foods too early can trigger food allergies and the baby can choke on the thickened formula.