The time for resuming sexual relations is different for each couple. Some couples resume their sex life within the first month. The majority of couples resume their relationships between one and three months following the birth of the baby. But, there are others that wait until about the six month mark, and some that wait even a year. There is no norm to aim for.
Another overwhelming factor is tiredness. Caring for a newborn baby twenty four hours a day is exhausting both physically and emotionally. When you finally do get into bed you just want to sleep.
Your own body perception may also hold you back. Your body may feel so changed by pregnancy and birth that you need time for it to recover. You just don't feel like your old self. Many women report that their libido is low during this time in their lives. They just don't feel sexy.
The first priority for you as a couple should be to set aside some together time. A great many couples complain that there just isn't time for each other during the first weeks with a baby. Words and cuddles effectively express affection and emotion. Both of you will benefit from this kind closeness. Sex doesn't have to mean full penetration. The stimulation of touch by itself can be highly pleasurable.