Accepting the fact that your baby isn’t gonna be the baby anymore :(

Of course he will forever be my baby, I just feel so bad. I don’t want him to feel jealous or any type of way once baby brother or sister comes 😭 we have a 7 year old and my son will be 2 in May. So my first born had 5 years with us before any babies came. I can’t shake this feeling of guilt and sadness 😢 any tips?