The only time I am really concerned when a 14-month old is not yet talking is when they:
* are not making eye contact
* they are not interacting with anyone -- mom, dad or their peers
* are not show prelinguistic skills like pointing or holding up objects to share what they have discovered with others
* when you try to give them a high-5, they cower away or don't raise their hand in response to the greeting
All children develop language at their own rate. It is not uncommon for 14-month olds to not be talking quite yet but, if they are showing signs of any of the red flags listed above, I would definitely address this issue right away with your pediatrician and contact your State Early Intevention Department ASAP. I would also highly recommend, if you have private insurance available, getting a referral to have your chid evaluated by a developmental pediatrician and a speech therapist right away.
Even if your child is making eye contact and his social and prelinguistic skills seem to be pretty good, if you suspect that he may have a language delay, then there is absolutely no harm having your child evaluated by a speech therapist. Some children do have oral motor planning issues or apraxia that interfere with their ability with learning to speak. Speech therapy really does help them to overcome these issues.
Wishing all the best for you and your child.