i would strongly suggest that you take him to a doctor since he has had lingering problems after the falls. if he has not gotten better after so long it is unlikely to improve by just waiting.
what to expect? what should we do? . my 4 years old son had 2 bad falls within less than 48 hours where he hit his forehead badly. the first resulted in a cut and the second in a bump. a week after these 2 falls we started to notice that he have hard time remembering words and speaking problem concentrate confusion unable to remember same day events anxiety and complains about his eyes. . it has been 3 months now and some symptoms has improved but most did not (bad days and good days) and we are not sure what to expect here?