I started off with my first dc by putting her down to sleep in a cot. She had what the doctors called a 'near-miss cot death' when she was 2.5mo old. I was told if I had been a minute later getting medical help for her, she would have died.
Since then, I have co-slept with all my dc. DD is now 13.7yo, she moved into her own bed at around 3.5yo. DS1 (now 9.6yo) only wanted to co-sleep for 18 months, then he wanted his own bed. DS2 (now 7.11yo) was very non-cuddly, and only co-slept until 8mo. DS3 is 9mo tomorrow, and still co-sleeping.
None of my dc have ever had any problems co-sleeping, in fact, after DD's episode, I was given advice by HCP's TO co-sleep, as statistically if done properly, it is actually SAFER than putting a baby in a cot, as the baby is more able to regulate it's temperature and breathing.
No-one will ever be able to persuade me that putting your dc to sleep in a cot - often in another room, no less (
) is safer for a baby than co-sleeping, when the human race evolved TO co-sleep in order to protect your baby from predators. Thise people above who have said that you wake up before your baby is sick are telling the truth - the hormones released when BF'ing mean that you are more aware of your baby.