You are in :Penguin Games
Stilted Into but minimalistic gameplay
The solution to this problem is rather simple because there is a pattern, which when applied always works, no matter the number of pairs. First you move one pair across, leave the parent, and return the little one (step 1). Then you board another little penguin, move them across together, and leave the baby of the same color as the parent which is already there (step 2). You go back for the third baby penguin and you can take it from there because it gets easy (step 3). Since this might sound complicated I recommend you take a look at screenshots and video walktrough (the solution is only 20 seconds away).