Sorelle Furniture Boston 4-in-1 Convertible Crib

The Boston model is listed as a 4-in-1 crib that can be used as a standard crib, toddler bed, full-size bed, and bookcase configuration. The conversion parts and instructions should be matched to the exact Boston model number.

Use a standard full-size crib mattress rather than a twin mattress. Sorelle crib instructions commonly specify a mattress at least 27 1/4 by 51 5/8 inches and no thicker than 6 inches. [Sorelle crib manual](https://www.manualslib.com/manual/1261465/Sorelle-Montgomery-4-In-1-Crib.html)

Sorelle conversion rails are often sold separately, even when the crib is marketed as 4-in-1. Common Sorelle parts include Toddler Rail 136 and Full Size Rails 215, but compatibility must be checked against the Boston model. [Sorelle FAQ](https://sorellefurniture.com/pages/faq)

Lower the mattress support as soon as a child can sit, pull up, or stand, because the higher setting is intended for a younger infant. Always follow the Boston assembly manual and stop using the crib when the child can climb out or reaches the manual’s limit. [Sorelle instructions](https://sorellefurniture.com/pages/faq)