MorahRach- I wish you much nachas from your child(ren)!
Having a new baby is stressful in itself: hormonal changes, sleep deprivation, body changes, new demands on time and energy. Are you getting enough time to take care of yourself??? This will not improve your finances, but will help you feel more like a menschette. This pampering doesn’t have to be costly. You deserve it. It will put you more in the mind of being grateful and being able to speak to HaShem.
Some ideas you can do even if baby is awake:
-Plan a regular get together with a friend(s) who also has a new baby for coffee/tea and adult talk for an hour or two every week. Mommy Club?
-If you have a friend where you can leave the baby for an hour or two, take a nap. SLEEP has a way of changing our perspectives for the good!
-If they won’t help you financially, can you ask your MIL/FIL to come watch the baby so you can take a walk?
-Put on some of your favorite music and really listen for 5 minutes. Sing at the top of your voice.
-Exercise. Especially if you miss the gym. Use bags of rice for weights, or do jumping jacks.
-Do your nails (if you like that sort of thing).
-Visit a nursing home or bikur cholim with the baby. (It’ll cheer them up, too.)
-Get a massage.
-Bubble bath.
-Make a “home date” with hubby. Cook something special and yummy but low budget (look for vegetarian recipes online – beans & rice are cheap), light a candle, put on some perfume, have a drink together, like when you were dating.
IMO, your husband needs to ask his parents for financial help, and you said in your OP that he doesn’t want to talk about it. (The suggestion to ask for a “loan” was brilliant.) This is something between them and goes back further than when you entered the picture. I can understand and feel your resentment. It hurts to be treated unequally, but he’s not the only sibling in the world experiencing this. If he asks the folks and they say no, that should be the end of it, and you and hubby should move on from that point.
As yytz suggested, a very good thing is to pray for the in-laws and the siblings receiving $$$. If you carry a resentment, it will only hurt you and drag down your spirit. Ask HaShem to grant them all you wish for yourself: good health, parnassah, shelter, food, luxuries, etc. You’ll find yourself open to receiving HaShem’s bounty without feeling as stressed as you are. I wish you luck… and this too shall pass.