Iron is essential for growth and brain development in toddlers, who have high needs relative to their small stomachs. Because many toddlers’ diets can be low in iron—especially when milk consumption is high or dietary variety is limited—iron deficiency anemia is a common nutrition concern in this age group. Early detection matters because iron deficiency can affect development even before anemia becomes severe, so screening helps catch problems before they cause lasting effects and allows timely intervention, such as increasing dietary iron or providing iron supplements. The other statements aren’t accurate: iron is required in the toddler diet, not optional; screening for iron deficiency anemia is recommended rather than rarely indicated; and iron overload is not a common concern in healthy toddlers unless there is a specific disorder or excessive supplementation.

Screening for developmental delays in primary care relies on a brief, multi-domain tool that can be quickly used during a well-child visit. The Denver Developmental Screening Test II is designed for exactly that setting: it screens children from birth to about six years across four domains—personal-social, fine motor-adaptive, language, and gross motor—and flags children who may have a delay, guiding a need for more comprehensive follow-up assessment. Its popularity in pediatric practice comes from being relatively quick to administer, straightforward to score, and specifically intended for routine screening rather than diagnosis. If a child is flagged, clinicians can proceed with a more in-depth evaluation or refer for early intervention services. In contrast, WeeFIM measures functional independence and is typically used in rehabilitation or discharge planning, not as a general primary-care screen. The Vineland Adaptive Behavior Scales provide a detailed assessment of adaptive behaviors and are more time-consuming and usually used for diagnostic or eligibility purposes rather than quick screening in busy clinics. The PHQ-9 is a depression screen designed for adults (or older adolescents) and does not assess developmental milestones in children.

Measles spreads through airborne particles that can linger in the air and travel beyond close contact. Because of this, the appropriate isolation approach is airborne precautions. In a hospital setting, this means placing the child in a negative-pressure room and ensuring staff wear respirators (such as an N95) or higher-level protection when entering the room. Standard precautions are used for all patients, but airborne precautions specifically address the airborne transmission risk of measles. Droplet or contact precautions alone wouldn’t fully prevent spread since measles can be transmitted through the air over longer distances.

A severe allergic reaction to a previous vaccine or to a component inside a vaccine is a true contraindication to giving that vaccine again. An anaphylactic reaction means the body could react explosively upon re-exposure, risking another life-threatening event. Because of this high risk, vaccination should be avoided until a healthcare professional assesses the allergy and determines safe alternatives or precautions. Mild illness with a fever under 38°C, recent antibiotic use, and an upcoming surgery do not constitute contraindications. Vaccines can usually be given when a child is mildly ill, antibiotics don’t affect vaccine safety or effectiveness, and surgery does not require delaying routine vaccination unless there are other specific medical concerns.