In a national survey of 1,334 mothers, 40% said they gave their baby solid food before they were 4 months old, with 9% starting as early as 4 weeks.

Baby formula that is supplemented with fatty acids in an attempt to mimic breast milk does not boost infants' brainpower any more than formula without extra fatty acids, according to a new review of several studies.

Nestle is to buy U.S. drugmaker Pfizer's infant nutrition business for $11.85 billion.