(CNN) – Rick Santorum's daughter, Bella, turns four on Sunday, the former presidential candidate posted on Twitter Friday, along with a link to a website to send birthday wishes.
"Our daughter Bella's 4th bday is on Sun. Celebrate w/us! Tweet a bday wish w/#happybirthdaybella or send a wish," he wrote.
Bella, the youngest of Santorum's seven children, suffers from a chromosomal condition called Trisomy 18. Half of patients born with the condition do not survive past the first week of life, according to the National Institutes of Health.
A great family man with greater family values!!!
Happy Birthday little one!!!!
Our daughter Bella's 4th bday is on Sun.
Happy Birth Day Bella , I hope you have a wonderful intimate joyous day on your 4th !
Hopefully with out Tweeter and Facebook , just family ,cake and love.
Happy 4th Birthday sweet Isabella.
You are a precious gift of God to your family and this world.
President Obama is doing a great job being POTUS. He will have my vote in the next upcoming elections.