My son is 5.5 months old and wakes up 3-4 times at night. Will introducing solids help him sleep through the night?

If your baby is breastfeeding then child might be hungry Coz bm is more diluted than fm. I intro cereals with bm/fm when my bb was 5 mths old. Her last feed was cereal with milk on her night feed. That reduced her night waking and able to sleep better.