Hi! I'm new here.
My son is two (twenty-six months) and has the hypotonic form of cerebral palsy as well.
Like someone else said here, the initial injury is done--the child should not get worse. However, there are some areas that may require management. In general, I find that these are less in kids with the hypotonic forms of CP. For example, we take no medications for my son's tone and we've had no surgeries because of his CP. There's another boy in our area with the hypertonic form of CP and he's had botox injections and hip surgery and now he's looking at another surgery.
If they think that the child is "caught up" at two and a half, I would think that it is a very mild form of CP. Here is a uselful tool for determining a child's level of involvement and potential issues: http://www.chsd.org/documents/CP/gmfcs.pdf
Motor Classification Scale for Cerebral PalsyI can think of one child on the 'net who meets the description of "mild case of hypotonia" and that's Holland over at Holland and Eden: http://micropreemietwins.blogspot.com Holland is the one in the glasses--not the one in the wheelchair.
I have my own blog, but my son falls more into the category of moderate as opposed to mild. My blog address is http://birdonthestreet.blogspot.com
I wish you the best of luck in this decision. CP kids can be very inspiring, but it's always good to go in with both eyes open!
Katy