The baby-products industry is a huge business. According to retail industry research firm IBISWorld, spending on baby products in the U.S. alone was a $23 billion business in 2013. With approximately 4 million babies born in the U.S. each year, plus the prospect of international growth opportunities, it’s likely that baby products spending is only poised to grow going forward. Most parents will do (and spend) whatever is necessary to keep their bundles of joy happy and healthy. This results in a remarkably steady level of spending. Even in a recession, new parents are reluctant to sacrifice the well-being of their babies. You can be sure there are companies lined up to profit from this. For those investors interested in the baby-products industry, two companies reign supreme: Procter & Gamble (NYSE:PG) and Kimberly-Clark Corporation (NYSE:KMB).