Dear OP's DP
Get a fucking grip. Your beautiful darling wife is undergoing 9 months of strain and possibly throwing up and cramps and swelling and knackeredness and itchiness and incontinence and all sorts, followed by what is MAJOR ABDOMINAL SURGERY, immediately after which she is going to establish breastfeeding.
Breastfeeding is not a merely physical action. Being stressed out or unhappy can prevent it from happening, as a woman has to be relaxed in order for her milk to let down. There's a huge psychological component. Now, breastfeeding isn't the be-all and end-all of parenting, but it is good for your baby, usually good for the mother, and, most importantly, IT'S WHAT YOUR PARTNER WANTS.
Your lovely wife, who was traumatised by her previous birth experience and developed Post-Natal Depression, which is a serious disorder, is asking for some peace and quiet in order to establish this.
Your goal in life, for at least the next year is to a) man up and do whatever it takes to nurture and protect your growing family or, b) fuck off and stop actively poisoning your partner's wellbeing with your selfishness and childishness.
Listen to yourself 'Ooh, my wife's having an operation and wants some privacy after, but it's all about what I want, I WANT MY MUMMY AND DADDY WAA WAA I NEED SUPPORT.'
After my C section I basically sat naked with tubes coming out of me all over the place, bleeding from the fanny, leaking milk down my chest, with a catheter in, throwing up, and being ludicrously over emotional. Picture yourself in that scene, bleeding from the cock and leaking from the balls, with them out on display because you're trying to attach a squawling newborn to them - whilst remaining serene. Do you want your parents in law 'helping' because 'they won't mind'?
Dear OP
You are lovely, tell him to sort himself out. Put yourself first and don't be scared. You owe it to your baby to put yourself and him/her first, never mind the PILs' getting narked.
Also have your birthday and anniversary how you want it. Put your foot down and be bolshy, sod em.