Rise of Fascism. As the United States turned inwards to deal with the lingering effects of the Depression, militaristic regimes came to power in Germany, Italy, and Japan promising economic relief and national expansion.
Human faces are one of an infant's favorite and fascinating things to observe, especially when it's mom or dad or his own image staring back at him in a mirror. By 3-months-old, most babies know the difference between familiar faces and strange ones.
You'll be the recipient of most of your baby's smiles, but he'll also exchange grins with others (that is, until stranger anxiety kicks in at around 6 months). As your baby gets more smiling practice and enjoyment from seeing people's reactions, he'll start adding sound effects, Dr. Gettleman says. It will start with cooing at first, and then lead to small giggles and waves of giggling, he says. By 5 months, your babe may surprise you with full-out belly laughs and squeals of excitement.