Girls, my baby is 6.5 months old. I want to start giving him pieces al…

Girls, my baby is 6.5 months old. I want to start giving him pieces already, but I'm very afraid. I understand that it's time to start (he eats porridge and puree) I gave him a piece of banana for the first time last week - and he coughed started coughing hard and I was very scared and he was too. How did you give pieces? What fruits what vegetables? Tell me!