Zambrano / Irish parenting doctor letter

Hi all I have a question if someone can help me with please
I'm applying for zambrano case but I can't get a letter from doctor because I'm not registered there I tried few times they were busy and didn't accept any new patient
I attended most of appointments with wife before and after baby
Is there any other way then a doctor letter
Like affidavit from me and wife
Or any other suggestions if anyone been through like this
Any kind of help will be appreciated

All they need is an evidence confirming the presence of child in the state.Assuming child is below 3 year's, you can register the child in crèche and obtain a letter.
Getting a letter from GP is better and cheaper Invar you can’t afford the crèche.
Thanks