Sweating around the head is quite common in infants and if the baby has no other symptom, just ignore it as the recovery takes place when your baby grows older. Some babies have sweat on the palms and soles due to hyperactivity as their sympathetic nervous system
is over active. Again no need to worry. If your baby is growing well, gaining weight and is active then perhaps this is just a constitutional symptom and will disappear as the baby grows older. Incidentally over-clothing the baby also makes him perspire excessively.