OPINION: The Talk. Read. Sing.® campaign’s singing birds have been coaching us on one key note: the first years of each child’s life are a game changer. That’s because 90% of a child’s brain development happens before the age of five. However, there’s also a narrow window in a newborn baby’s life when bonding with a parent has a profound impact on their development and future success — making those first few months matter, too.