does kids sense the pregnancy !?

Lilo
So we just found out that I'm pregnant 10days ago and we decided to keep it to ourselves at least for couple of months (I told 4 of my girlfriends already lol 😂) anyway my stepson l who 7ynd lives with us  every other week and since we got him last Friday he is been really clingy and sweet he kept rubbing my belly and being so close to me and that's not him ,I married his dad a year ago and just moved in 8 months ago and he was very distant ,he keeps asking me if the baby will come in 9 months and how he will be when the baby arrive also he heard me telling my husband can I buy those now (meant babies clothes ) he was fat but he heard me an said u mean for the baby ! Today we received foot spa it was still in the box 📦 he came from a school and said is this for the 👶🏽 I feel like when we tell him he will be like I knew u were pregnant I was just not sure how many weeks 😂😂😂😂😂😂🤔 is this normal !? How do kids know !?😳🤔