Pets are also useful for doing a quick whip around for scraps under the high chair.Other people get rid of their cats for these reasons, and that's why animal shelters are overloaded with unwanted, rejected pets.
People know that cats will usually live for X amount of years. People also generally know that their own breeding years are usually between X and Y and that they MAY have babies in their future. Do they not consider these things when purchasing a pet?
Honestly, if you use common sense, your baby will be fine. My cat wanted to sleep in the cot before my baby was born... the moment she was born, he never went near it again. Some people install screen doors to the bedroom, so you can still hear the baby calling out from the cot, but the cat can't get in. It might be something to consider if you're worried about smothering.
Otherwise, just watch your baby when the cat's around.
Cat hair is unlikely to kill your baby unless it's born with a severe allergy. Not every baby will face-plant the carpet and lick it, getting a mouthful of cat hair. Our carpets were vacuumed maybe twice weekly... there were 2 cats in that house, and I don't think I ever had her choking on fur. Or even having a little bit of it in her mouth. The only risk was when she decided she'd try to munch on the cat itself, but they were smart enough to know to stay away from that wriggling, screaming thing that tried to grab them.
Keep your house relatively tidy, worm and flea your cats, and all should be well.
(And apologies if the irresponsible pet owner thing comes off as harsh and mean, but seriously... cats end up put to sleep for this crap all the time, and it's just disgusting that people who think pets are disposable like this are pet owners to begin with).