it is very common after child birth for a woman's hormonal levels to NOT return to normal thus affecting her sex drive, most often diminishing it.
The safest thing to do is have your wife go to her gynocologist and have her hormone levels tested an d more then likely once she's on HRT she will want sex again.
also flowers, a nice massage, or day spa gift certificate, or cooking dinner, cleaning dishes, putting kids to bed also help with putting her in right mood for you
