I have a 4 1/2 mo little boy. He weighs in at 16 lbs. WOW I know. He was 8 lbs at birth and has always been at the 80-85% for both weight and height. I started solids at 3 1/2 mo because all the suddon he started waking up more at night. I too am breastfeeding. No problem with that. My problem is that he still wakes up at night hungry. Like last night he had #1 jar of carrots around 8:30 then I feed him 2 tbsp of rice cereal at 11:00 hoping that would keep him asleep longer. I nursed him afterwards and put him to bed at 11:40. We stay up late--it's crazy. He woke up at 2:30, 4:30, 6:30 and 9:30 he stayed up. Each time I will breastfeed for about 10 mins to make him fall back to sleep. He won't take a paci. I've always been told that if they eat cereal it helps them sleep. I wonder if it causes him to have tummy pain or gas. I never hear any toots but by 9:30 this morning he filled his diaper.
I guess to help you with your question feeding at the age you are should be ok. My pedi told me to start solids at 4 mo and I did the same for my 4 yr old daughter. I never had as much trouble with her waking up. I guess boys are more needy.