Is it true that indian runner duckling cannot swim in their first month

Mine swim from the day after I pick them up at the post office. Just use warmish water, towel dry when done and it them ba k where warm when done so they finish drying and can preen

 

I let mine in the tub when they were one week old, just make sure the water isn't too deep.

 

From Day Two - mine started in a cake pan with 90F water - just an inch and a half of water reached their bellies! TLWR wrote the approach I have taken.

@karelwo