Letting a Baby Play on an iPad Might Lead to Speech Delays   By Kelly Wallace, CNN A study found a link between handheld screen time and speech delays It is believed to be the first study to examine mobile media device use and communication in babies    Anyone raising a child today has likely fretted about screen time and wondered about the impact of devices on our kids. Does the technology affect their brains? Does it limit their social development? Could it harm them emotionally? Could it delay when they start talking? I had never thought about that last question until a new study, released Thursday and being presented…