Form both hands into "C" shapes, as if you are holding a square block in each hand. Hold your hands in front of you with your palms facing each other. Move your hands in an alternating up-and-down motion, mimicking the action of stacking building blocks.
Sign 'baby', 'love', 'play', and then use the alternating 'C' handshape motion to sign 'blocks'.
Sign 'you', 'stack', 'blocks' (using the alternating 'C' handshapes), and then indicate 'higher' by moving your flat hand upwards.
Sign 'blocks', then 'put-away', and finally 'toy' and 'box' to show where the items should be stored.
Sign 'baby', 'love', 'play', and then use the alternating 'C' handshape motion to sign 'blocks'.
Sign 'you', 'stack', 'blocks' (using the alternating 'C' handshapes), and then indicate 'higher' by moving your flat hand upwards.
Sign 'blocks', then 'put-away', and finally 'toy' and 'box' to show where the items should be stored.
Yes, this specific sign with the 'C' handshapes and stacking motion is generally used for children's toy building blocks. For a city 'block' or a block of wood, you would typically fingerspell the word or use a different classifier depending on the exact context.
Usually, two to three alternating movements are enough to clearly convey the meaning. You do not need to do it for a long time unless you are emphasizing that someone was playing with blocks for an extended period.
While this sign works well for general building blocks, Lego often has its own specific sign (usually fingerspelled L-E-G-O or signed by pressing 'V' handshapes together to mimic snapping bricks). However, in a general context of 'building blocks', this sign is perfectly understood.
