Pu and team compared embryonic Baby Louie to Gigantoraptor, which together represent informative stages in the ontogeny (growth) of giant caenagnathids. Elements like the dentary probably fused together after hatching and this element remained with a consistent size (relative to other skull elements) during the growth of the individual. Although both taxa feature different mandible-to-femur length ratios (∼0.87 Beibeilong vs. 0.45 Gigantoraptor) indicating difference in relative skull sizes, it is most likely that these are product of their respective growth stages. Shuo Wang and colleagues in 2018 concluded that caenagnathids experienced a dietary shift as they grew up, based on several features in the dentaries of caenagnathids (lateral occlusal grooves and ridges on the occlusal surfaces, interpreted as vestigial tooth sockets). Accordingly, caenagnathids had teeth when young and were progressively lost during their growth. However, the perinate Baby Louie specimen of Beibeilong lack some these in spite of its young age. Wang and team suggested three scenarios for explaining the lack of vestigial alveoli in Beibeilong, arguing that this taxon was an strictly edentulous; teeth were indeed present in Beibeilong but were lost before eruption of the null generation of teeth; or, that teeth erupted later and were lost at a much higher rate in Beibeilong than other caenagnathids, therefore, vestigial tooth structures should be preserved in more mature specimens. In 2019, Gregory F. Funston with team strongly rejected this interpretation and hypothesis concerning the ontogeny of caenagnathids. They indicated that the phylogeny of Caenagnathidae, along with other primitive oviraptorosaurs such as Avimimus, strongly implies that simple dentaries lacking complex structures (such as vestigial alveoli) are the ancestral condition of caenagnathids. The second point made by Wang and colleagues was also considered unlikely, because it would require a slowdown in the development of a horny beak, which would in turn require caenagnathids to reacquire functional teeth from an edentulous ancestor, and also teeth would offer no adaptive benefit. Lastly, Funston and team rejected the third scenario given that Gigantoraptor—which is mostly similar to Beibeilong, and represents a very mature giant caenagnathid—lacks any occlusal ridges or grooves, hence disproving the hypothesis that Beibeilong and other caenagnathids had teeth and lost them during ontogeny. Reproduction Pu and team in 2017, based on comparisons with other Macroelongatoolithus egg clutches, noted that the arrangement and size of the eggs associated with Baby Louie indicates that the original nest would have been large and ring-shaped