Are other people having trouble understanding your child? Is your child having trouble understanding you? Are there some speech sounds that you have noticed they can't produce properly? All of these things can be a sign that there is something going on with your child's speech and language development. If these difficulties are left untreated it can cause trouble at school academically - with reading, writing and learning; or socially - with making friends and understanding emotions. It is so important to have your child assessed by a speech and language therapist as soon as you notice these difficulties - the sooner your child gets support, the better the outcomes will be!
Have a look at this article by ASHA (the American Speech-Language-Hearing Association) - http://www.asha.org/content.aspx?id=8589942698 In this article you will find some red flags for communication development.
I hope everyone is enjoying the sunshine (it is starting to feel more like summer now!) and don't delay to contact a speech and language therapist if you are worried about your child's development.