Mixing things up?

So me and my boyfriend have been together now for 3 years. Our son was born this year so things have shifted a little in our relationship, and we broke up earlier this year for almost 2 months, when we got back together we had the spark we’ve always had...well forward to quite a few months later, my son is 7 months old, and starting to get around more and all, and I feel like the spark in our relationship is just going out. I’m not sure how we can bring it back. I love him, but I just want the spark we’ve always had. It’s making me feel like I’m falling out of love with him. The Sex is still good for the most part, the it’s like we’re just having sex..no love between us like their used to be.