As Kimberly already stated you cannot become an OB without being a GYN, you have to be both. If you are interested in babies though you should look into becoming a pediatrician instead. OB’s do not work with babies, they take a mother through pregnancy and childbirth but are focused on the mother and have nothing to do with the baby after birth. After a baby is born the pediatrician will take over and follow the baby throughout the time in the hospital and all of it’s well baby checkups. As a pediatrician you would work with children as they grow into adults so you would work with people up till the age 18. You can work in either a hospital or out-patient setting depending on what you are interested in. If you are interested in only working with newborn babies you could look into being a NICU nurse, these nurses take care of infants that are critically ill, often babies that are born prematurely.
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Obstetrics is the surgical field that deals with childbirth; gynecology is the field that deals with women's health, particularly the repoductive system. One can be a gynecologist without being an obstetrician, but you cannot be an OB with being a GYN.
If you are a caring person and you love babies, perhaps you should look toward pediatrics
Kimberly recommends the following next steps:
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I agree with the other answers and I would encourage you to look into nursing, specifically labor and delivery nursing. These nurses work on the labor and delivery floor and also can rotate to the nursery (in some hospitals) to help take care of newborns. This field may be appealing to you, especially if you are passionate about OB and not GYN. A labor and delivery nurse helps the mom go through the birthing process by monitoring both mom and baby. This is really a unique field in nursing and definitely should be on your list of careers to look into.
You could also look into becoming a nurse midwife. This requires first a BSN in nursing, followed by a masters program in midwifery. Midwives may work under the supervision of an ob gyn. They may do hospital births, birthing centers or home births. They do prenatal care as well. Some will follow newborns up to 6 weeks of age