For twins, the cot must handle double the weight and activity. Prioritize solid hardwoods like Beech, Birch, or New Zealand Pine over MDF or particle board for the frame. If the design is a 'side-by-side' or 'convertible' unit, check the integrity of the central divider and ensure the mattress support base is made of reinforced steel or solid wood slats. For multi-functional models, verify that the conversion kits (to toddler beds or daybeds) are included in the initial quote to avoid future compatibility issues.