M.O.
Call early intervention- my son has low muscle tone and is almost 2. I saw the signs you are talking about when my son was 2 months- though, I didn't know anything about low tone. I called EI for speech problems when he was 1 and they found the low tone problems. He has been in physical therapy and has been progressing well! I have seen babies as young as 2 months at the EI clinic where I take my son for PT.