Rushing my babies life

I know i’m probably just sensitive, but it makes me so sad when people tell me they can’t wait for my newborn to walk, talk, kindergarten, ride bikes, etc. I wish they would just enjoy him being little and his innocence. He will only be this little once. I lay in bed and cry while holding him in the morning because my leave is almost over. I’ll probably never have this opportunity to stay home with him again. I just wish people were more sensitive to this. It’s not a secret that i feel this way.