Calum's baby?

After years of dating Calum breaks up with his girlfriend Alexia but what he didnt know is that she was pregnant he left her for years when all of a sudden they cross paths again and when he sees the baby what will happen? He was only 20 when he got her pregnant and she was 19 what will happen? She kept the baby but didnt keep contact with anyone of the 5sos boys or one direction she wanted to keep the baby a secret but when they find out you wont believe their reactions