My son was a very easygoing baby, but now that he's a toddler, he's much more rambunctious and even throws temper tantrums. One minute he acts like a little dictator, the next he's like a whiny little baby. You're feeling what many parents feel as they watch their baby become a toddler.
Toddlers can challenge the skills and shake the confidence of any parent.
It sometimes helps to imagine how the world might look through your toddler's eyes. As an infant he probably saw smiling faces, felt gentle hugs, heard soothing voices. To him, everything in the world is waiting to be explored. But when he does explore, he gets praised sometimes for being bright and curious and scolded other times for getting into the wrong stuff. It's hard to figure out the difference between what's OK to touch or taste and what's not.