Suggest Remedies For Dryness In My Vagina During Sex

Hi. I am a 39 yr old mother of 4. I just had a baby 12 months ago. After I had her my orgasms are now dry . Me and my partner have to apply lube all the time. Does that mean that i am entering menopause? Is there something i can do to stay wet? Do i have to be on some type of hormonal therapy? Is that why i am experiencing this because my hormones are out of wack? Please help..