Thanks a lot to all of you for the comment
Of course a newborn's penis is small. Yours was probably exactly the same size. If you are reacting to the fact that the testicles are unusually large looking by comparison to the penis, the two will come into balance after a while. Testicles on a baby are rather enlarged when they are born because of the hormones of the mother. Nothing to worry about. Don't mess with your baby's penis, just wipe it when you change the diapers.
there is no way to increase an infants penis size. why worry about the size anyway? it will grow