Juandre
Like Esmari said - Congratulations on your pregnancy! I don't have 4 children but am expecting baby no 2.
I can only imagine the shock you & your husband are going through. I can understand your fears you have because of age gaps, you just recently had a baby & having 4 children are demanding. Then there will always be the financial worries. I'm sure the list can just go on & on & on BUT every pregnancy is a miracle.
Try not to think of the negative impact - I know it's easier said than to actually not worry but just but all your trust in God & really just leave it with HIM cause he will help you & your husband through it!
My mother had 5 children
1st husband - Had twin girls then tried after 6 years to fall pregnant. It took them 3 years to conceive me. My dad past away 3 weeks before I was born.
2nd husband - Got married 3 years after my dad passed away. Got pregnant with another girl & then 3 years later with my brother.
Though there weren't really very very small age gaps between us, she still had 5 children to raise & same worries that you have about the older ones getting less attention.
But you know what, if you have a good family support system, you guys will be fine. Your children will be fine. There is a 9 year age gap between me & my twin sisters, 4 years between me & my younger sister & 7 years between me & my brother but we all get along really well.
Try to atleast spend alone time with the oldest daughter once a month IF possible. Have some nice chats @ meal time or take her to a movie, sit & read a story together........anything you can think of. If it's too difficult for both you & your husband to do something with her, then do it on your own.
All of the best.