generally pale white patches like these are common in newborns and infants..these are called as milia which resolve spontaneously within few weeks ,,
it also may occur due to vitamin and iron folic acid deficiency
,,.so u can better give multivitamin
drops to your child for this for 1 mth..
and even then if they do not resolve with growing age , then u can go to ur paediatrician..
right now u need not panic bt js keep observing for a few weeks ..if the baby is healthy with good feeding and good movements then nothing to worry..