Dad likes to. B. N the baby on his knee

It appears that there is a typing error in your question. Nevertheless, if you are asking about the activity that a father enjoys doing with a baby, I believe you meant to say "Dad likes to hold the baby on his knee." This is a common practice where a father supports the baby on his knee, providing both physical support and bonding time. It is a soothing and playful interaction that allows the baby to feel secure and entertained.