Sforno on Exodus 2:4/ספורנו על שמות ב׳:ד׳

1לדעת מה יעשה לו. She thought that some Egyptian would pick up the baby as a foundling. There were no doubt many such illegitimate babies in Egypt who had been abandoned by their unwed mothers. The prophet Ezekiel 23,20 speaks about the sexual licentiousness in Egypt that would make such incidents nothing out of the ordinary.