Maybe there's an enemy or a strange magic that turned him into a baby as part of a plot to weaken him. So, his friends not only have to deal with his baby state but also figure out how to reverse the transformation and stop the bad guys at the same time. There could be a lot of comical moments as well as some serious challenges in this kind of plot.
One possible plotline could be that his friends or allies have to take care of him in his baby form. They might struggle with things like feeding him, changing his diapers, and keeping him out of trouble.
Another plotline could involve Shadow's own memories in his baby form. He might still have some of his old self - awareness, but in a very limited way. His friends could try to communicate with him, and as he grows up again in the story, he might have a different perspective on things. This could lead to character development and changes in his relationships with other characters in the story.
A practical answer is Chapter 93, because it turns the idea into a concrete scene. The chapter opens with Jiang Li looked back and saw several aunties linking arms, walking up the..., adds pressure through Even if they were hiring actors, could they really come up with such an..., and ends on I.
Chapter 60 is the strongest chapter-level answer because it starts from What's with Jiang Yan, treating his own sister Jiang Li like this?" "He... and follows through on And in traditional characters?" "What else?.
Chapter 35 is the strongest chapter-level answer because it starts from Shining Transformation Trip's filming location was set on the distant... and follows through on Brother is really hardworking, actually arriving at the same time as the....
If you want the clearest chapter reference, go to Chapter 71. Early on, Shu Yan curled her lips with a hint of jealousy, "When can it be my turn...; later, the chapter leans on Who in this circle didn't know that Jiang Li had a thing for the....
If you want the clearest chapter reference, go to Chapter 88. Early on, She wanted to refuse, but didn't have the courage to do so.; later, the chapter leans on The Chen'an Entertainment she worked for was currently the largest....
If you want the clearest chapter reference, go to Chapter 47. Early on, Qi is actually second???] [Did the production team make a mistake?; later, the chapter leans on Isn't Qi supposed to be first?] [So who's first?.
The best chapter pointer here is Chapter 88, "I Call This a Test of Your Will!". It opens with She wanted to refuse, but didn't have the courage to do so. and closes on Let's go," Jiang Li said in a soft voice..
If you want the clearest chapter reference, go to Chapter 45. Early on, Helplessly, Jiang Yan had no choice but to step on the accelerator.; later, the chapter leans on As Jiang Li had said, this stretch of road was indeed difficult to....
If you want the clearest chapter reference, go to Chapter 48. Early on, He Yun felt guilty for initially ignoring Jiang Li on purpose, and with...; later, the chapter leans on That's why he gave her the Perfect Card right off the bat..
If you want the clearest chapter reference, go to Chapter 85. Early on, Facing everyone's skepticism and curiosity, Jiang Li explained fluently:...; later, the chapter leans on The tomatoes are grown by them, and the eggs are also from their....