Four months old today

Trying to eat hands. Been a very good baby today sleeping and sucking fingers mainly. Saying boo and blowing spit bubbles. Jacob bit him this morning a totally uncalled for attack but Freddie didn't cry much despite having tooth marks in his tiny hands hours later. Perhaps he's learning nit to give Jacob the desired reaction but I doubt it. Just a very relaxed child. Hope he takes this trait with him through life.