What are the criteria for baby Pokemon?

Question

Like Smoochum is a baby but a level one Machop isn't.

Answer 1

To be considered a baby Pokemon, a species must:

• be able to evolve,
• be the first Pokemon in its evolution chain,
• be obtainable by breeding one of its evolved forms, and
• be unable to breed, by virtue of belonging to the Undiscovered Egg Group.

Many baby Pokemon were introduced in a generation later than their evolved forms, but this is not proper criteria as demonstrated by Togepi, Riolu, and Toxel.

Answer 2

A pokemon that has an initial moveset, then later had a lower pokemon added to its evolution chaing would be considered a baby pokemon. Smoochum was added in generation II, even though Jynx was made in Gen I. Machamp, however, had his evolution complete the whole time. Machamp wasn't added in later.
For the most part,they can only be obtained by breeding or getting them from an egg.

The baby pokemon are Pichu, cleffa, igglybuff, togepi, tyrouge, smoochum, elekid, magby,azurill, wynaut, budew, chingling, bonsly, mime jr, hapinny, munchlax, riolu, and mantyke.

Comments

Togepi, Budew and Riolu are introduced at the same time their evolutions

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Roselia (Gen 3) is older than Budew (Gen 4).

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And Togepi (2) is older than Togekiss (4)

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1. It says that it happens when a PRE-evolution was added so the Togepi argument is invalid
2. this still does not explain riolu and toxel
the roselia thing was an error from my side