Baby Roll-up Slats
15 slats made of solid wood, each approximately 5 cm x 2 cm and spaced about 3.8 cm apart, connected without metal using a sturdy cotton band that prevents squeaking and creaking because the slats rest on it.
This slatted frame measuring 70 x 140 cm, made of 20 mm thick beech slats spaced reasonably, is certainly more than a baby needs, but it can't hurt if the slatted frame is a bit too stable.