growth spurt?

Krisnralph

My DS just turned 10 months old. I nursed him around 6 he ate his dinner at 6:45 he was ready to go to bed at 7:56 so I nursed him then. He woke up screaming at 8:45 I could not get him calmed down so nursed him again, he woke up screaming at 9:45 he was trying to nurse but just screaming so my DH feed him 4oz of formula then he went back to sleep for the rest of the night.  My DS has never ate that much in such a short time before. I think I have low supply I can't get enough pumped to cover what he takes at daycare (sometimes I think I have way more in my breast then what I am pumping) but I haven't had trouble with him not getting enough when I nurse him. Growth spurt at 10 Months??