How this scaling is done I am following this tutorial on character modelling but I am stuck at 2:43 how he scale it on y axis.




But when I scale the same edges my edges become straight unlike his moving inside. How he is doing that scaling ?
Very simple, press s to engage scaling mode and then press y to choose the y axis, when you move your mouse it will only scale on the y axis. You can do this with x and z also! Make sure with that character, you choose both the back and front or else if you choose one edge only, it will straighten or curve it depending on how you scale it!