I am ME first.
It is easy to lose yourself in the first hectic years of parenting. I almost did.
Last year I had a real wake up call when DH started telling me how unhappy he was. I took me a long time (and several threads similar to this one) before I really understood the problem.
Somewhere in the last couple of years I got so caught up in being a mother that I neglected myself and in doing that I neglected our relationship too.
The first step was to book a weekend away, without kids, it was so relaxing and fun. We did get out of bed to do some sightseeing but we had more sex in that weekend that we had in some months previously.
I am trying to lose weight, looking for a parttime job and getting better at keeping the house in order, these were big issues for us. This makes me more self confident which of course makes me more likely to initiate sex (or want it when he does).
It is about self confidence and being able to say, "bugger everyone else, I am doing xx today". And about putting CBeebies on on Sunday afternoon and locking the bedroom door
Saying all of that, the OP's situation is very different as you still have a young baby. It takes time to get back into the swing of things, and tbh, I don't think that we had sex at all in the first 3 months after DS's birth.
Domesticallychallenged
I think that your DH is being unfair and too hasty, your baby is only 3 months old. Your thread yesterday made me think that he is a bit worried about you hence the suggestion that your mum help while he is away. I think that he put it very badly and you should tell him this. You need him to help build up your confidence, not knock it down.