Baby expenses

I am frustrated over money. I am earning 50% lesser than my husband and I have been covering most of the expenses including the hospital delivery fee. Just because he doesn’t have savings plus his 2 kids with his ex wife. I feel super upset with that and it seems like the baby is mine. Told him and he said we often quarrel over baby now while before the baby came we were all fine. He doesn’t get the security and probably he is tight in his wallet and can’t do much too hence no emotion to that.