11 month old gone off formula

Ni

My LO is 11 months old and has suddenly gone off formula. He will have around 4oz in the morning, the same during the day and 3oz at bedtime. Even if we don’t give him any during the day, he still won’t have any more at night. He’s eating well with solids. He’s not good with drinking water either lately.

Tried all sorts of sippy cups for his milk and water.

Any suggestions?