When Pharaoh's daughter opened the basket and saw baby Moses, what was he doing?

Answer: Crying

The little boy was crying (KJV: "the babe wept"), so she had compassion on him and said, "This is one of the Hebrew children."

“When she opened it, she saw the child, and behold, the little boy was crying. So she had compassion on him and said, “This is one of the Hebrew children.””— Exodus 2:6 (BSB)