Dont read anything into dreams,when you sleep,all that you have seen and heard in your lifetime can be recalled in your subconciouse,and get muddled together,sometimes things youve heared and seen get mixed up and are remembered when you wake .Memory storage is infinite and your dream could be sparked by seeing bad things in the news,and your mind sees the worst thing that you could imagine,this is a painfull dream ,but all it shows is the love you have for your child,and the realisation that bad things happen,this is what keeps you protecting your loved ones,it could be a memory jogger to show,you have to be dilligent in this day and age .But dont read anything into it,i am sure your child will be safe.