In the rulebooks, ALL the rulebooks, even the first one, it says that an attack, is when you use anything below the picture that's above thw Weakness/Resistance/Retreat cost that's not a Pokémon power. Therefore...

If the baby is active and you use Withdraw, Juxtopose, Jab, Tail Wag, Swords Dance, Feint attack, Lullaby, it doesn't matter! IT IS STILL AN ATTACK ON THE DEFENDING POKéMON! However, if the baby is benched and a non-baby is active, you don't have to flip to Feint Attack, Flitter, Stretch Kick, etc., the baby!