The Bible doesn't say, it just says when he grew up, inferring that he was weaned:
Exodus 2:9,10- "Phar′aoh's daughter then said to her: "Take this child with you and nurse him for me, and I myself shall give you your wages." Accordingly the woman took the child and nursed him. And the child grew up. Then she brought him to Phar′aoh's daughter, so that he became a son to her; and she proceeded to call his name Moses and to say: "It is because I have drawn him out of the water."
The maiden was Pharaohs daughter, she became his foster mother.
Pharaoh's daughter found Moses. She raised him, but his own mother continued to nurse him when an infant.
Moses was discovered by the Pharaohs daughter, in the river, and gave the name Moses, which means taken out of the river.
Moses means drawn out, this name was given to Moses, by the pharaohs daughter.
Moses was of Hebrew parents, but he was hidden in the river Nile, and the Pharaohs daughter found him and adopted him.
The baby Moses was rescued by the Pharaohs daughter, as she came for a bath in the river, Moses means taken from the river.
Moses was rescued from the river Nile, by the Pharaohs daughter.
The Pharaoh's daughter Thermuthis (Bithiah), who discovered him while she was bathing. He was then adopted into the Royal Family.
In the Bible, it was the Pharaoh's daughter who raised Moses.
Original name of Moses is Moshe, but when Pharaohs daughter took him from the water , she gave the name Moses, meaning taken from the water.
Bithiah
As moses was taken from the river by the Pharaohs daughter to the palace, Aaron did not go there. He stayed with his family and sister Miriam.