IF you fight a lot, then you definitely do NOT need more children!!
What makes you think that fighting is GOOD for children?
BABIES do not make marriages happy... DO you see how many pregnant women are harmed and killed every year? Their bodies are burned and hidden...
You need to WAKE UP and save yourself and your 3 CURRENT children from a relationship of fighting.
I have been married for 4 years now, WE NEVER FIGHT.