Children's allergies are on the rise in the United States and are particularly common among the wealthiest in society, said a US government report on Thursday.
The number of new teenage mothers in the United States is at its lowest level in nearly 70 years but remains the highest of any major developed country, according to official figures released Tuesday.
WASHINGTON — Advances in fertility treatment and a trend toward later-life childbirth are fueling a boom in twins in the United States, where one in 30 babies is a twin, according to US data out Wednesday.
