On the Life of Moses: Books 1-3 (1.16-1.20)

and while she was still hesitating, the sister of the infant, who was still looking out, conjecturing her hesitation from what she beheld, ran up and asked her whether she would like that the child should be brought up at the breast by some one of the Hebrew women who had been lately delivered;

and as she said that she wished that she would do so, the maiden went and fetched her own mother and that of the infant, as if she had been a stranger, who with great readiness and willingness cheerfully promised to take the child and bring him up, pretending to be

But when the child began to grow and increase, he was weaned, not in accordance with the time of his age, but earlier than usual; and then his mother, who was also his nurse, came to bring him back to the princess who had given him to her, inasmuch as he no longer required to be fed on milk, and as he was now a fine and noble child to look upon.

And when the king’s daughter saw that he was more perfect than could have been expected at his age, and when from his appearance she conceived greater good will than ever towards him, she adopted him as her son, having first put in practise all sorts of contrivances to increase the apparent bulk of her belly, so that he might be looked upon as her own genuine child, and not as a supposititious one; but God easily brings to pass whatever he is inclined to effect, however difficult it may be to bring to a successful issue.

Therefore the child being now thought worthy of a royal education and a royal attendance, was not, like a mere child, long delighted with toys and objects of laughter and amusement, even though those who had undertaken the care of him allowed him holidays and times for relaxation, and never behaved in any stern or morose way to him; but he himself exhibited a modest and dignified deportment in all his words and gestures, attending diligently to every lesson of every kind which could tend to the improvement of his mind.