Brooks started to smile around 6 weeks. We only got to see a few a day and half the time it was because of gas. Now we see them all the time. He has become a different baby. Between weeks 3-8 we had a sensitive little one that seem to get upset easily, but recently he has been all smiles. (I personally think it was because of his dairy allergy that didn’t get diagnosed until week 4.) This morning he was so happy I took picture after picture of gummy grins. These three were the best.