DD who is 20 months old banged her head quite badly on laminate floring whilst running around. I immediately picked her up and she didn't cry for what seemed like 30 seconds she had a very pained look on her face and started to go blue, before finally taking a massive gulp of air and crying. Afterwards she was holding her head and was sleepy, but perked up after about 15 minutes. I think she is okay now as she has been smiling etc but, is it normal to hold breath and then go blue, is it shock? DD has done this before but not for so long, should i be worried?