Maker lists it for Butterfly 2 and Butterfly 2 Plus.
About this pair
The Cybex Cloud Q goes on the Bugaboo Butterfly 2 with the Bugaboo Butterfly 2 car seat adapter (model 400018003), about $69.95. With the carrier on, you are pushing about 29.9 lb (16 lb stroller, 13.9 lb carrier). The seat itself is rated up to 35 lb and up to 30 in, per Cybex.
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18 other infant seats fit the Bugaboo Butterfly 2.
Summary from the makers' published data.
How to set up the Cybex Cloud Q on the Bugaboo Butterfly 2
What you need
The Bugaboo Butterfly 2
The Cybex Cloud Q carrier (its car base stays in the car)
The Bugaboo Butterfly 2 car seat adapter (model 400018003)
The adapter maker shows the fitting steps in pictures; see the manuals below.
Before every walk
Check that the carrier is locked on both sides the way your manual describes. How we check our answers
Last check: give the carrier handle a gentle tug. A seat that is fully latched does not lift off.