i guess gumball just overfed him until one دن he grew legs. i don,t really know but they should have an episode where we can see darwin growing his legs.
The is just one episode that is تقسیم, الگ کریں into two bits Because gumball was ADHA as 4 سال old. He was دیا Darwin when he was accidently flushed down the toilet. But when he was about to die on dry land gumballs love for ہوم made him evolve into having lungs this is also the reason why Darwin has legs.
