OK, first of all, as everyone has said, 7m is not long - bet you've read in the books about waiting until your 6w checkup, as if leaping upon each other should be uppermost in your minds. Erm, not quite true. Yeah sure some people do, but far from everybody does. Not even him - he may also be tired and overwhelmed.
Hormones - even though you've stopped BFing, you're still not back to your pre-pregnancy hormone levels, and that can take months longer to even out. So desire can be affected by that as well.
Fatigue - need I say more?!
Habit - well, you've got out of the habit, and if your drive wasn't particularly strong in the first place, then you don't really have the impetus to make the effort to get back into the habit.
Busyness - there's so much to do. But do you prioritise yourselves at all, or are you doing what you think needs to be done: laundry, dishes, tidying, shopping etc? Truth is, it can all wait, and you're not bad parents for being sloppy from time to time, or even always.
Love V Lust - he loves you, and that lasts longer than lust. And, while lust is good, it's not the be-all and end-all of a strong relationship. You're trying to do something about this together, he sees your commitment to changing this situation, togetherness is the most important thing.
What we did...
Reconnect with each other: First of all, we banned the TV. Unless there was a particular programme we wanted to watch, we didn't switch it on. And we switched it off after watching said programme. No more TV dinners - supper at the table, facing each other. After telling each other about our day, telling dh about ds, we decreed a baby-free hour, when we talked about other things, trying to recreate some of what we had before having a child.
Take off the pressure: We agreed not to have sex. But instead we made sure to give each other lots of displays of affection - also the little inimacies, like clearing dh's blocked pores, dh giving me a foot massage. Bringing home little presents, flowers from time to time. Making sure to talk to each other on the phone every day. Making sure to kiss each other and hug and touch each other. Knowing that I wasn't going to have more demanded of me than I was able at that point to give, made me feel so much more relaxed and affectionate. I think affection is the crucial thing at this point.
And if and when you decide to make love, remember also that you don't need to go 'all the way' first time. As long as both of you agree so that nobody is pressured or disappointed. Also, you can make love without being in the mood. You may want to do something special for your dh - I know this isn't a particularly 'liberated' point of view, but if it feels right to do this, then why not. You can bolster yourself with a drink, even make it part of the foreplay (navels and liqueurs ). Take a bath together to help you into the mood. Have some lube readily available to help you along.
Eventually, I found myself making the effort to make love even if I wasn't feeling like it (though not if I felt that I really didn't want to). Usually it was me who initiated, probably because dh didn't want to put me under pressure, but gradually dh began initiating. And I found that the more I made the effort to make love, the more lustful I began to feel, and the more I enjoyed myself.
A long spiel, I know, but I hope there are some helpful pointers in it. Please try not to feel guilty about this, and be open with your dh about your love for him and that he is still desirable, even if you struggle to express that desire physically.