First of all, I would urge you to be very, very cautious re; accepting medical advice from non-medical professionals. Even if someone say their doctor said something, they could be remembering it wrong, or have an ancient doctor who has been doing things the same way for 30 years, when we know better now.
Having said that, we are planning to delay vaccines and only do selected ones, and we are doing pneumonia. It is a very, very common disease, and with all of the places your child goes where there are many young kids he is sure to be exposed. If it goes into the bloodstream he has a 20% chance of dying. It also is the most common cause of meningitis. If he gets that, there is a 30% chance of death, and possible brain damage/hearing loss if he survives. I highly recommend the new book The Vaccine Book by Dr Sears, which is where I got this info from. It can really help you decide which shots to do, when.
BTW, pneumonia is bacterial, and colds are viral, so the poster who said she didn't get this because she wants her kid to get colds is confused.