hi welcome to healthcaremagic there are lots of reasons why children turn blue....but of course the most common and serious problem is an underlying heart disease...these r called blue spells and i would advice u to meet ur cardiologist and get an echo at the earliest....let me explain this in detail...Blue spells, which are also called “cyanotic spells”, are short periods when a reduced amount of blood flows into the lungs. Since blood carries oxygen, less oxygen is delivered to the body. As a result, a child may appear blue or bluish. Most spells last less than a minute. During a blue spell your child may suddenly feel uncomfortable or be cranky or less alert ,Begin to breathe faster and deeper ,Turn blue, especially around the mouth and face ,Faint etc Blue spells are caused by reduced blood flow to the lungs.The most common cause of blue spells is contraction or narrowing of the area below the lung artery. This narrowing lowers the amount of blood going to the lungs. The children most often affected by blue spells are those with Tetralogy of Fallot (a form of congenital heart disease). However, blue spells may also occur in children with other forms of heart disease in which blood flow to the lungs is reduced.Some children may appear blue after getting cold or having a bath and these r not blue spells.Blue spells are most commonWhen a baby cries strongly ,Soon after waking ,Soon after a feeding , Soon after a bowel movement ,If a baby is dehydrated and needs liquids..... If your child has a blue spell, do not panic. To help your child, follow these steps: place your baby on his back. Bring the baby s knees up to touch the chest and hold them firmly in place. You can also do this while holding your baby. Comfort and settle your baby by holding and rocking, giving a soother, and gentle cuddling. Remain calm. Your baby can sense when you are upset, which will make it harder to settle the baby. IF is your child s first blue spell, tell your child s cardiologist (heart specialist). thank u and take care