My oldest didn't walk until she was at least 14 mos...and even then it was just a couple steps. I blamed it on the fact I used to put her in one of those baby walkers. We lived with my brother & SIL at the time and they had a cement patio by the pool and I was too paranoid to let her walk out there! Also, I think she was held all day at daycare. We used to call her our lazy little lump...yes, it was a term of endearment

To this day, she is extremely active and bright but she is a bit of a couch potato and stubborn...not sure if there's a correlation based on her 'tempermant' as a baby?
So, I think it's abosolutely normal that Vincent is not walking yet. He's just not feeling it...too busy doing other things to be bothered with walking. And, I'm sure the small space has something to do with it!