Help ladies!

Sin • 31 years old, mother of 2 beautiful girls, a handsome boy, and stepmom to a beautiful teenager. Married for 11 years
I have a 15 year old stepdaughter, an 9 and 7 year old daughters and am expecting our first son in July. I desperately want to come up with a sweet pose for all 4 children for newborn photos but I have zero ideas. Most newborn/sibling shoots online are a newborn with siblings who are young too (aged 1-5) but my kids have a huge age difference. How can I do this?