This is a prospective mixed methods study to assess weight changes in women randomized to receive Implanon ® or Depo Provera® (DMPA) immediately postpartum compared to women who choose non-hormonal contraception or no contraception immediately postpartum. After enrollment, subjects return for a visit at 3, 6 and 12 months postpartum to be asked a series of questions, take a pregnancy test, and be weighed. Total length of participation for each subject is 1 year or until pregnancy.

Inclusion Criteria:

• English speaking
• Aged 18-45 at enrollment (inclusive)
• Immediately postpartum of a live singleton infant, 37 weeks gestation, at HUP
• Desiring to delay another pregnancy for 6 months
• Willing and able to follow the study protocol

Exclusion Criteria:

• Breastfeeding during study participation
• Plans for relocation outside of Philadelphia in the next six months
• Plans for use of weight loss medication or diet pills in the next six months
• Women who wish to start Implanon ® or DMPA prior to discharge but who do not want to be randomized. 5. Issues or concerns in the judgment of the investigator that may compromise the safety of the subject or confound the reliability of compliance and information acquired in this study

First, we chose to exclude nursing women. Second, we had a small sample with power to detect one standard deviation difference in weight loss. Third, all data were collected prospectively,thus we did not have each participant's pre-pregnancy weight.