The night before, I had fallen onto the floor in my sleep, something that hadn't happened since I'd first graduated from a crib to a bed and to prevent me from rolling out of it my parents had to set a pair of kitchen chairs at the side of the mattress.

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Many makers sell optional conversion kits costing as much as a couple hundred dollars, which turn the crib into a toddler bed, often partially surrounded by rails and low enough to get in and out of without help.

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Each night, Marlene Aisenberg put Sabrina to bed in her crib.

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Some opposition to SIDS monitors is based on a fear that parents will depend on monitors instead of following other, more effective medical measures, including always placing babies on their backs to sleep, keeping redundant bedding and soft objects out of the crib, and not having babies share a bed with adults.

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