Why Does He Wake Up At Night?

Since having LBM last week, my little Toby has been waking up again at night and asking for milk. He wakes up either 1 or 2 times a night. He only drinks a bit of milk then goes back to sleep. He used to sleep straight already. And now, I wonder what has happened? Last night, I tried not to give him milk anymore but he just kept crying for 10 minutes. So as not to wake up Kyla, we went down and got some milk, after sipping a bit, he went back to sleep on his bed. He drinks milk from the cup already.

Have you ever experienced this? Any advice?