Your baby is still so very young. Don't worry too much about how he goes to sleep right now- in your arms, on the breast, in a swing, in a sling, whatever. IMO, the first few months are about promoting routines, encouraging baby to sleep at night and be more active during the day, maybe even trying to develop a napping routine. To reach those goals, you do what works in order to get baby to sleep- if that means rocking or nursing, etc., it's just not a big deal. You have plenty of time to get baby to sleep more independently. Now is a great time to read Elizabeth Pantley's book "The No-Cry Sleep Solution" for a realistic look at infant sleep and tips on gentle ways to encourage baby to sleep without using you as a crutch.