We co-slept with DD2 until she no longer wanted to at 5 and a half months (think this ones going to be very headstrong!)
it was fantastic for us, everyone would get a decent amount of sleep and my boobs were always there for her to grab a feed whenever she wanted to, half the time i didnt even know she wanted a feed till i woke up to her feeding!
if it works for u then definetly do it, if not its not a big issue