Stress can affect your endocrine system in regards to increasing chances of dysfunction with abnormal hormone or insulin production. Hormones are the chemical controls of your body and due to the stresses the rates of hormones overall are changed. This can become chronic changes, that affect your body.
It's too early for the baby to get custom to being picked up every time it cries most babys cry when they need attention or the basics gasy hungry or to be changed him touching the baby comforts the baby and this is a stage of development where the bond between parents and infant is made.
-Will make you run faster.
-Will make you jump higher.
etc.