The difference in parental attitudes between first-borns and subsequent children is large and significant.
第一次怀胎与其后相比，父母的态度变化巨大而且意义非同小可。
2
Birth order, they found, had no effect on personality: first-borns were no more, nor less, likely than their younger sibs to be conscientious, extrovert or neurotic.
最终他们发现，出生顺序对性格没有影响：头胎可能和弟弟妹妹一样认真，外向或情绪稳定。
3
First-borns might score higher on measures of intelligence, because, at some point in their lives, they were only children who were the sole recipients of their parents' attention.