While antibiotics can be a lifesaver when your toddler is sick, cranky and lethargic, they can be just as dangerous as they are helpful.

A sudden change in a toddler's behavior is a cause for concern. Drastic personality changes or inexplicable new reactions to normal events that used to be no problem could be an indication of serious problems, including abuse, bullying, depression and behavioral issues.

Toddlers are naturally curious and energetic, often much to their parent's chagrin. Your 2-year-old's whirlwind personality means you're constantly on the go and chasing after your tiny ball of energy. Still, it's likely your pediatrician won't be alarmed. Hyperactivity disorders aren't typically diagnosed until age 4.

Up until now, your child has spent a lot of time being coddled and held and taught. Now that she’s 2 years old, she’s ready to take on the world on her own terms. While turning 2 brings other exciting milestones, one most notably is the prevalence of tantrums and other acts of defiance.

Although many parents fear the “terrible twos,” tantrums often start between 12 to 18 months. Young toddlers start to experiment with their autonomy and their newfound sense of self by attempting to control some aspects of their environment.

Temper tantrums are a common part of a toddler's development. Normal tantrums are bad enough, but some children get so out of control they throw up. The sight of a toddler vomiting may worry parents, but it is not an unusual phenomenon and in most cases is not dangerous.

An 18-month-old falls into the toddler age group, so you can expect abundant energy and curiosity from your little one. His curiosity might get him into trouble on occasion, and he may misbehave if he becomes tired or bored.