What does Exodus 2:9 mean?

Pharaoh ordered the death of all Hebrew boys (Exodus 1:22). Moses' mother defied this command, keeping her son until he was too large to conceal before placing him in a floating basket among the reeds, which provided opportunity for rescue (Exodus 2:2–3). In an interesting twist, Pharaoh's own daughter discovers the baby and feels compassion (Exodus 2:6). She speaks to Moses' mother (Exodus 2:8) and arranges for him to be weaned and brought back to her. Instead of Moses dying in the Nile River, he is rescued, adopted, and placed into the care of his own birth mother. Further, Moses' family is compensated for this! This was especially significant since the Jews were already slaves under Egyptian control. Pharaoh's daughter could have forced the job upon her, but instead showed favor to the mother of Moses. The entire scene reveals God's divine work during a dark time in the history of the Jewish people.

As expected, Moses' own mother cared for him until the time he was weaned and could eat solid food. This would have been at least a year. Many children in ancient cultures were nursed until two or even three years old. The most formative time of Moses' early life remained in the arms of his own mother during a time when baby boys his age had not even been allowed to live.