Its amazing. Your child is becoming more responsible, mature, following instructions faster and is blossom before your eyes. You're bragging to friends and family about how smooth things have been in your household and that everything is just going so well.
Then, out of nowhere, some one turns back the clock and you have a baby on your hands again. You're hit with waves of whining, crying, screaming, and even wanting to be held all of the time. Your once independent child is now insistent on you dressing him and has suddenly forgotten which shoe goes on which foot. They begin to thumb suck, want to sleep in your bed, and wont leave your side.
And the baby talk.
One of the most common behavioral shifts during a regressive period for a child. They begin to leave out words in sentences, make their voice higher pitched, and seem unable to communicate any desire in a sensible way.