Cases of Congenital hamartoma of the chest wall in infants are rare and their bilateral involvement is extremely rare. An 18 month-old child presented with bilateral chest wall swellings since birth which were gradually increasing in size. The X-Ray of the chest wall revealed bilateral involvement of 1st, 2nd and 3rd ribs with involvement of extra-pleural soft tissues. The cytological diagnosis given was round cell tumor of the chest wall keeping in view the presence of round cells in a hemorrhagic background. The biopsy revealed areas showing mature cartilage, bone, fibrous tissues along with hemorrhagic cystic cavities. Basing on the biopsy report, final diagnosis of chest wall hamartoma was given. Following complete excision, the child was doing well and there was no recurrence of the lesion as observed in the follow-up sessions.