I am so, so sorry for your loss Trinpy
We lost a little boy last month at 21+4, I absolutely echo what *Foxy" had said, it is so shit and utterly heartbreaking and I'm so sorry you're having to go through this.
Ask for painkillers if you need, there is also a medication to stop/stunt your milk coming in.
Hold your boy, take a book in maybe to read to him, sing him songs, tell him how loved he is and will always be. Take a blanket to wrap him in. I wrote a note to tuck inside his blanket and send with him.
The hospital may take his little hand and footprint for you, but if not, take an ink pad and some card, so you have them.
He never knew hunger or cold, sadness or fear, all he knew was the warmth of your body and your love. He will always be part of you, and part of your family.
I will light a candle for your boy and say a prayer for him tonight, if that is ok with you 💙