J.W.
A 9 month old may very well need feedings at night, ignore those who say otherwise. He could be having a growth spurt. It's also common that as infants become more mobile and active during the day, they are only really able to concentrate on nursing at night, when distractions are fewer. Also, are you working? If so, your baby be doing something called reverse cycling, which is taking more milk in at night when you are available to him. Good luck! And hang in there.