Help relationship advice, is this the end!

I have been with my partner for 4 year now, we have a ten month old baby together and I have a 4 and half year old from a previous relationship, I have been with my partner since my 4 year old was 5 months old. I love my partner dearly I really do however recently we have been arguing a lot. Don’t seem to be getting along st all. For some reason he just seems to be getting on my nerves constantly, I don’t want to split up I would rather try and fix it, I don’t want to argue/bicker all the time, I want to be back to how we are but for some reason he is really getting on my nerves, this is really upsetting me, any advice on how to fix this please 😔