This is an active baby! I have this piece in both a lying down (with feet in the air), crawling and sitting up pose. The product number is the same on all three pieces, 6124.
What is not clear is whether the three were designed and sold as a set of ornaments as I am awaiting to discover more information in the British Trade documents in the National Archives in Kew Gardens, London. So far there is no record of anything in the time period that DURON was around!