The fontanelle of children is generally said to be the fontanelle, due to brain development, from birth to 6 months with the increase in head circumference fontanelle is also increasing, after 6 months fontanelle gradually shrinks, 1.5 years old when closed, this closure is only with the hand to feel it, and the skull of the child is not completely closed, at this time with the development of the brain, head circumference is still growing more slowly, after 6 years old head circumference is basically no longer growing and close to After the age of 6, the head circumference basically stops growing and approaches that of an adult. Many parents worry that their children’s fontanelle cannot be touched, so they do not give their children the cod liver oil that their bodies especially need, thus affecting the normal development of their children’s bones and causing rickets in the long run. The main reason for parents to worry is that if the fontanelle closes early, it will affect the child’s brain development. If the child’s fontanelle is not felt early, how to determine whether calcium should be supplemented or not (mainly refers to cod liver oil)? First of all, the child’s brain development or intelligence is normal, and secondly, the child’s head circumference is growing normally at regular intervals. All aspects of growth indicators are normal, then you must supplement cod liver oil or calcium in a timely manner, so as not to cause the normal development of the child because of insufficient calcium.