Stop using the bassinet when your baby reaches the manufacturer's recommended weight limit (typically 15 pounds) or can sit up, pull up, or roll over. "For the first month or two they are not going to go anywhere," Gary Smith, M.D., Dr. P.H., director of the Center for Injury Research and Policy at Nationwide Children's Hospital and president of the Child Injury Prevention Alliance, said of infants. "But when they start to develop, they do it really quickly, and all of the sudden they are rolling over and sitting up." If you don't take precautions, Smith said, "Parents who don't take precautions may end up taking their child to the emergency department from a fall."
She continued: “It’s as if you asked a climate-change scientist whether the fact that you bought a Prius would make a hurricane less likely in New Orleans this summer. Carbon makes a big difference and so does care-giving, but not at that scale. Of course if you kept a baby confined in a playpen and never took him out that would probably make a difference, but nobody actually would do that.” While science does suggest crawling strongly influences the way babies think and learn, she points out “babies in playpens are crawling and exploring too, of course.” Her last bit of advice? “Parents should try to think not ‘How will this affect my baby in the long run?’—who knows?—but ‘Is this helping my baby and me to thrive right now?’ ” That, she says, depends on what you and your situation are like—and only you know that.