thanks for your query.
your baby has one cheek bigger than the others.
in most of the cases its due to normal baby fat that will be corrected gradually as the age progresses.
another entity is there where congenital hypertrophy occurs in one side of the body but in that case it should not be confined only to the cheek but also it involves unilateral limb, face, gum etc and along with these there will be wilm's tumor
, absence of iris
, genitourinary abnormality and mental retardation.
are your baby developmental milestones are normal?
but i dont think your baby is not suffering from that.
but you should consult a good pediatrician
to take his opinion.
most probably your baby's problem is physiological. So dont be afraid.