M.H.
We always spent time in the evening before bed talking to the baby in my belly. I told my 4 yo that the baby could hear us. I went up and down the toy aisles one day, and per usual, my 4 yo was like, I want that, I want this, I need that, etc. So, my husband picked this really cool sparkly horse. We wrapped that and had my daughter open it at home when the baby went to sleep the first time. We reminded her that the baby "heard" her request for that toy. She was like, "she really could hear me!!! My lil sister is sooo cool!!!"