You asked

How does self control develop in a toddler?

Babies don’t have much self control, and nobody really expects them to. However, soon after your toddlers first birthday, you will expect him or her to listen to you and at least make an effort to do what you say. Of course, as your child grows older these expectations become higher and higher, and the more he or she begins to understand what is expected of them.

From 12 to 18 months your toddler will begin to have more self control and will be more co-operative. However, at the same time, they are also starting to assert their independence, so they could end up defying your wishes as well. These can be very trying times, and you will need to be realistic in your expectations of your toddler, and keep your temper in check.

At 19 to 24 months your toddler’s ability to resist temptation improves dramatically. For instance, they will be able to wait until everyone is present before opening his birthday gifts.
Between the ages of 25 to 30 months, if you praise mature behaviour in your child, you will find that this is a very good motivator for your toddler to be “big.” Tell them how fantastic it is that they put their blocks away all by themselves, and watch them swell with pride!

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.