The mother of a 3-month-old is concerned because her daughter does not yet sit by herself. Which statement best reflects average sitting ability?
a) Most babies sit steadily at 3 months; she is slightly delayed.
b) Most babies do not sit steadily until 8 months; she is normal.
c) Most babies sit steadily at 4 months; she is normal.
d) Sitting ability and the age of first tooth eruption are correlated.
Answer: Most babies do not sit steadily until 8 months; she is normal.
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