You asked

Do the terrible twos really exist, and what do I need to worry about?

The terrible twos are perhaps misnamed. In fact, the behaviour that characterises the terrible twos – asserting independence, testing limits and throwing spectacular tantrums – can start as early as 18 months, or as late as 30.

It’s perfectly normal for your child to have these fits of temper – after all, it’s frustrating when you can’t get what you want, or even express it properly.

The best thing you can do to get through the terrible twos is to make sure you’re patient. Don’t give your child any attention when they’re in the middle of a crying or screaming fit. Simply make sure they can’t hurt themselves, and ignore them until they are finished expressing their emotions.

If a temper tantrum strikes in public, stay calm, and move your child somewhere quiet, where you can both work through the tantrum, then carry on with what you were doing.
Distraction is another tactic that works with some children – try offering your child a toy, snack, or activity when you see a tantrum brewing.

More questions

There is no right or wrong age to get a family dog; however, you should be mindful of your situation before you rush into things. 
Serious risks and medical conditions associated with regression of a child’s motor skills
Drooling and difficulty eating can be associated with normal toddler behaviour, illness or sensory processes.
Up to the age of three, your toddler will be over separation anxiety. However, as there are so many separations in the years of growing up – pre-school, a few days away at camp, and even your child’s first year at college, bouts of separation anxiety could very well occur from time to time all through your child’s life.
As long as your toddler has plenty of space and time to play, and practice all their new physical skills, they’re probably doing just fine with her development!
Toddlers are naturally curious about everything. Instead of stifling that curiosity, you should be making every effort to promote it!
Your child’s imagination is not only a source of fun – it’s one of his or her most important early learning tools.
Young children are emotional beings. The worst thing you can do is make them stifle those emotions. Teach them how to cope with them instead, and you’ll raise a well-adjusted child.
If you want your child to grow up with a strong spiritual foundation, it’s never too young to start teaching, but remember to teach by example.
For toddlers, as with older children and adults, happiness comes from inside, not from outside.