A nurse is collecting data from a 6-month-old infant in the well child clinic.
Which of the following findings should the nurse expect?
Infant's birth weight is tripled.
Lateral incisors are present.
Posterior fontanel is closed.
Infant sits well without support.
The Correct Answer is C
Choice A rationale
The infant's birth weight typically doubles by 4-6 months and triples by 1 year of age. If an infant's weight has tripled at 6 months, it may indicate overnutrition or an underlying health condition.
Choice B rationale
Lateral incisors usually appear between 9 to 13 months. At 6 months, the central incisors are more likely to be emerging.
Choice C rationale
The posterior fontanel typically closes by 2 to 3 months of age. Therefore, by 6 months, it is expected to be closed.
Choice D rationale
Infants usually sit without support around 8 months. At 6 months, they may sit with support or briefly without support but not consistently.
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Correct Answer is C
Explanation
Choice A rationale
The infant's birth weight typically doubles by 4-6 months and triples by 1 year of age. If an infant's weight has tripled at 6 months, it may indicate overnutrition or an underlying health condition.
Choice B rationale
Lateral incisors usually appear between 9 to 13 months. At 6 months, the central incisors are more likely to be emerging.
Choice C rationale
The posterior fontanel typically closes by 2 to 3 months of age. Therefore, by 6 months, it is expected to be closed.
Choice D rationale
Infants usually sit without support around 8 months. At 6 months, they may sit with support or briefly without support but not consistently.
Correct Answer is A
Explanation
Choice A rationale
Asymmetric thigh folds are a common sign of developmental dysplasia of the hip (DDH) in infants. This physical examination finding indicates that the hips are not aligned properly, which can cause the folds in the thighs to appear uneven.
Choice B rationale
A shortened thigh, rather than a lengthened one, on the affected side is more typical of DDH. It is due to the femoral head not being properly seated in the hip socket, which can cause a discrepancy in leg length.
Choice C rationale
An inwardly turned foot is not a characteristic finding of DDH. This symptom is more commonly associated with conditions affecting the feet and lower legs, such as clubfoot.
Choice D rationale
The absence of plantar reflexes is not typically associated with DDH. This reflex involves a different part of the nervous system and is not linked to hip dysplasia.