Quote Originally Posted by kalinka_vinnie
Моего первого ребенка буду так называть!
Just to make sure.
What you said implies that you already have more than one child and means that from now on you are going to call "unofficially" the first one by that name.
If you haven't any children yet you should have said
"Моего первого ребенка так назову!"
and it would have been her official name.