Game Of Thrones: Is Gendry Really Cersei Lannister's Son?
4. Robert Would Go Hunting While Cersei Gave Birth
If Cersei did send her baby boy away in secret, then how did she do so without Robert knowing about it? A scene from Cersei and Sansa might offer a key clue here, as Cersei says:
"Whenever my time was near, my royal husband would flee to the trees with his huntsmen and his hounds. And when he returned, he would present me with some pelts or a stag’s head, and I would present him with a baby. It's not that I wanted him there. I had Grand Maester Pycelle, an army of midwives, and my brother."
So if Robert always disappeared, that means there would have been a very clear opportunity for Cersei to rid herself of the child and simply pretend to Robert that he had died during the birth. Pycelle was loyal to Cersei and would've helped cover it up, the midwives wouldn't speak for fear of repercussions (and being paid off), and Cersei and Jaime certainly had the money to hush anyone else who might've known too.