I'm really unsure of what to do, ever since i got pregnant last year and had my baby 3 months ago my partner's parent's behaviour has really grated on me. Sorry for the long post, I just really need to get this off my chest and pretty certain saying how I feel out loud will give me bitch status.
I hope that it's just my hormones post natal that make everything they do really irritating.
First of all I'm a very private person and hate having my photo taken and I do not really do social media.
When I was pregnant MiL was constantly taking my picture to get a picture of my bump to post to Facebook despite several requests not to as she wanted to show her friends who were all going to be "nanny" to my baby also 
MiL has now posted pictures of my baby on Facebook. I requested she remove as not comfortable having baby pictures out there at the moment.
MiL puts on a babyish voice when talking to us, putting a "w" where there should be "r" in certain words and being incredibly patronising etc etc.
FiL wouldn't take my word for it when I said baby was hungry as he didn't want me to take her away to feed. Instead he put his finger in her mouth and said look no she's not.
Constantly telling us to ignore baby safety guidelines as babies were fine in their day. Such as it's ok to put a bouncer on top of a washing machine as the vibrations will put her to sleep or that leaving them in a car seat all day is fine. Also put her in car seat on top of washing machine as that will put her to sleep too.
Refusing to sit/stand in shade when holding baby in the garden the other day when it was really sunny and then said I was paranoid and didn't want anyone to hold my baby when I said I didn't want her in the sun.
Discussing my mental health in the next room with another family member and suggesting I have PND.
Turning up unannounced and saying they would only be here for half an hour and then staying for two and wanting to stay for a meal. I didn't have any suitable meals for 4 and they got annoyed when I took the baby to feed, then got annoyed because she then went to sleep and they wanted her awake.
The list goes on and on!
Probably a bit PFB, will accept people telling me to get a grip/give my head a wobble etc.