A miracle baby who born with most of his skull missing has celebrated his second birthday.

Jaxon Buell was not expected to survive after a serious brain malformation called anencephaly was spotted during an ultrasound, with doctors even advising his mother to have an abortion because he would likely die during the pregnancy.

But Brandon and Brittany Buell refused to give up, and on Saturday they celebrated an incredible day with their incredible boy.

'Two years ago today, Jaxon Emmett Buell was born and our lives changed forever,' the parents wrote on Facebook.

'Although many gave up on him too soon and others told us we would not see this day, today we are celebrating Jaxon's 2nd birthday! 

'Thank you to everyone who has followed Jaxon's progress and story along this journey. We continue to hope and pray for many more milestones for Jaxon in the future. And, today, we celebrate!'

But despite the celebrations, Jaxon's father revealed each day is a battle for the two-year-old.

‘He still has his struggles where he throws up, he still has several seizures several times a day, he’s still on the smaller side at 13 pounds but he’s certainly developing,' the 31-year-old told Metro. 

Brandon heaped praise on his wife Brittany, saying their little miracle boy wouldn't be surviving without her.

‘She’s been amazing. She has so much love and patience in working with him on a daily basis,' he told the newspaper.

‘That’s truly one of the reasons why he is the way that he is because of the one on one interaction that she gives him as his mother. It’s made such a big difference in his life.

‘I don’t know if he would still be with us and certainly he would not be doing the things that he’s doing without her loving and nurturing as his mother.’

Anencephaly is a neural tube birth defect in which a child is born without parts of the brain and skull.

About 1 in 4,859 babies in the U.S. will be born with Anencephaly each year and usually die shortly after birth, according to the Center for Disease Control and Prevention.

Source: Daily Mail