Changing up sex?

Any ladies got some advice to spice things up? I've been with my husband six years and we're currently on baby number two. I miss when we first got together and it seemed so passionate and exciting. In my mind I wanna try new things but I'm self conscious and feel stupid if I do. I'm not sure why it's this way because I know I'm not ugly. Is it possible to lose some attraction to your husband? I still love him more than anything and obviously like how he looks but I don't really get in the mood anymore. I just worry because I know sex is a big part of marriage and I don't want it to go downhill.