The most appropriate site for the first intravenous insertion for a 2-year-old child with gastroenteritis and dehydration is the dorsal metacarpals of the hand. Therefore, the correct answer is option 3.
Generally, the first choice for intravenous insertion is distal on the periphery of an extremity and progresses upward toward the body. Children older than a year and adults mostly use the upper extremities or limbs for intravenous insertion.
Scalp veins are only used for infants when their peripheral veins are inaccessible. Any foot veins shouldn't be used if the child already walking/ The antecubital fossa should be avoided as well because the arm must be immobilized to stabilize the insertion site to prevent an infiltration.
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