The phrase "height positions" refers to the different levels or locations at which something can be positioned vertically, usually in relation to other objects. Full definition
You also get to choose from four different height positions for the mattress. (earlymomentsmatter.org)
Use the upper height position for newborns (at least 8 lbs / 3.5 kg) so your baby is carried in the correct position close to your face. (babybjorn.eu)
It consists of one bounce pad, adjustable height positions, 12 plus interactive toys and cute characters. (followmum.com)