My son won't sleep at night???

Jo
Ok so my son is 6 months until recently he has been going to bed around 8:30 and not waking up til about 3:30 now he wakes up every 2 hours. He is teething and is exclusively breastfed and he when he wakes it is to eat. Could it be he's still hungry should I give him some baby food earlier in the afternoon before his bath time? Thanks!