So OP,
You are paying more than him, though he earns more.
He's a greedy pig with food.
You are afraid to mention it because it causes arguments.
So you have had a baby with a greedy pig, who is very tight with money and who you tip toe around because if you challenge him, it will cause arguments?
Can you see how this reads.
Greedy, nasty man that earns more but costs YOU more to feed because he is financially abusive.
Causing arguments when you ask for him to pay his share of what HE eats is abusive.
Doesn't sound as if you have any prize there.
Do you have real life support from family and friends?
Bullet proof your contraception but can you bear this greedy pig near you🤢
....and start being really honest about this relationship.
Keep posting