►False
Several studies have shown that the language development and skills of first-born and later-born children are similar. In fact, some studies have shown superior skills in later-born children in the areas of pronoun use and conversation skills[14]. One study showed that first-born children reach the 50-word milestone earlier, but that once children had reached the 50-word milestone, there were no differences between first- and later-born children[15]. So while older siblings often interrupt and talk for their younger siblings, this does not seem to have a negative impact on the younger sibling’s development.