I had a skiing accident and had a BAD spiral break (boken in 1/2 and shattered up and down) on my tibia and fibula also broken. I did not have surgery (but should have). I was in a series of casts for 7 months (longer than normal). My 1st cast was up to my hip--i had that for 6 weeks--BUT, I was back to work in a week, riding the bus and subway. At 4 months, I was in a walking cast (boot). At each cast change, I had them push my foot on a stool and hold it for 10 minutes before recasting to stretch my achilles (it was casted pointed down b/c that was the position of the foot when they took my ski boot off). They thought I was sort of strange asking this, but they did it--and it worked fo rme--my flexibility of the broken leg's ankle was not quite as good as the other, but it was good enough. When I got out of my cast, 7 months later, I required no PT and was walking fine. My running gait was off for about a year, but otherwise, I was fine and 18 years later am still fine, no pain, and yes, I have been back up the slopes! The 1st week is the worst pain, then it's Ok.
You will have to get help for the baby for a while--after that, you can probably manage if you ahve to. Put baby and you on the main floor during the day, even if you ahve to buy a cheap crib and put it in the living room for naps. You can frontpack the baby to get him/her around the house on crutches after you get used to them and your leg gets to feeling better. I think a baby is better than a 1 yr old b/c he/she is not mobile yet. it sounds like you knee is Ok---be glad, bones heal, knees can be messed up for good. hang in there. Elaine