Correct Answer: A

Rationale: Sex role identification begins during infancy as infants can identify body parts by the end of the first year. Preschoolers often engage in masturbation and sex play. School-age children continue to develop awareness of their sexual identity, including behaviors like hugging and kissing. Early adolescence sees further development influenced by sexual maturation and experimentation with sex roles. Therefore, the correct statement is that sex role identification begins in infancy. Choices B, C, and D are incorrect as they misrepresent the timeline of the development of sex role identification in children.

Correct Answer: B

Rationale: Head lag should be completely resolved by 4 months of age. Continuing head lag at 6 months of age indicates the need for further developmental or neurological evaluation. Laying the infant on his stomach promotes muscle development of the neck and shoulder muscles, but because of the age of this child, a referral should be the first action. The findings are abnormal for a 6-month-old infant. Significant head lag can be seen in infants with Down syndrome and hypoxia, as well as neurological and other metabolic disorders. While some of these disorders might include developmental delays, stating this to the parents without a proper evaluation can cause unnecessary distress. The priority is to identify the cause of the head lag through a medical evaluation before discussing potential outcomes with the parents.

Correct Answer: A

Rationale: Pinto beans contain the highest amount of folic acid among the options provided, with 294 mcg per 1-cup serving. Oranges contain 44 mcg per 1-cup serving, lettuce contains 60 mcg per 1-cup serving, and broccoli contains 78 mcg per 1-cup serving. Therefore, pinto beans are the best choice for increasing folic acid intake during pregnancy. Choosing oranges, lettuce, or broccoli would not provide as much folic acid compared to pinto beans, making them less optimal choices for meeting folic acid requirements during pregnancy.

Correct Answer: B

Rationale: The Apgar score is a method for rapidly evaluating an infant's cardiorespiratory adaptation after birth. The nurse assigns scores in five areas: heart rate, respiratory effort, muscle tone, reflex response, and color, totaling the scores. A score of 8 to 10 requires no action other than supporting the infant's spontaneous efforts and observation. A score of 4 to 7 indicates the need to gently stimulate the infant by rubbing his back while administering oxygen. If the score is 1 to 3, the infant requires resuscitation. Therefore, in this scenario with an Apgar score of 6, the correct action is to gently stimulate the infant by rubbing his back while administering oxygen. Initiating cardiopulmonary resuscitation would be excessive at this point, and rechecking the score in 5 minutes may delay necessary interventions. Providing no action except to support the infant's spontaneous efforts is insufficient for a score of 6, indicating the need for stimulation and oxygen administration.

Correct Answer: D

Rationale: Before administering the hepatitis B vaccine to a newborn infant, the nurse must obtain parental consent. Hepatitis B vaccine is typically given at birth, 1 month, and 6 months of age. Checking the infant for jaundice, checking the temperature, and requesting a hepatitis blood screen are unnecessary in this context. Parental consent is crucial for any medical intervention involving minors.