I am no doctor but I can tell you about my experience. I was almost 41 when my youngest son was born. My mother in law who was a music therapist in a nursing home encouraged me to play Mozart. I’d sit at my pc with headphones on my stomach with Mozart playing.
My baby lay quietly in my womb, no movement as long as the music was playing. Within a minute of the music going off, my stomach looked like a title wave. My friends would get tickled watching him trying to take out my kidneys!
By the time this little kidney kicker was in third grade he was reading at first-year college and had tested to the highest level. His vocabulary was excellent. I remember one day his grandpa took him to his house and within half an hour brought him home. I asked what happened, my son who was 2 said, “Papa is antagonizing me,” his grandpa said, “He started it!”
I can’t give Mozart all the glory, my firstborn which was 18 years earlier was extremely smart. His teachers said “we can tell you talk to him all the time. He’s the only kindergarten kid that can have a conversation that isn’t a yes or no question.
It might be worth a try to play Mozart while you’re carrying your baby, who knows may there is something to it?