Sex life crumbling and don't know what I'm going to do to change it. Xx

Been with my partner for nearly 5 years now and are sex life is crumbling it has gone bad since we had our little girl 2.5 years ago and now I'm pregnant again. We do the same position every time we have been doing it since I was pregnant the first time and it just seemed to stick. I don't even get horny anymore as it's boring sex and takes us both a while to cum. I feel like my confidence in the bedroom went after I had my little girl and I don't want my partner going somewhere else as he will get bored as I know I am starting too get bored and it's my fault but i can't seem to get confidence back with previous sexual partners I was very adventurous and I've done many different things but I just feel like I lost myself somewhere and would love some advice how to get it back and be that horny little devil I use to be again. I've tried dressing in outfits to make myself feel better and just don't feel it I hate how I look naked so how can I expect my partner to like what he sees anymore when I don't and it's not just my body that I don't like it's me as a person I just don't look at myself the same anymore. Xx