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I'm sorry. I don't speak... monkey! Banyanya?
—Count Olaf, Lemony Snicket's A Series of Unfortunate Events

Babytalk is exactly what the name suggests: talking or writing with the coherence and spelling of an infant. This will usually include all rs being replaced with ws, the suffixes -ickle and -oo being added to normal words, and Lust Objects being referred to by petnames like "Plumpycheeks" or "Snugglywoo." It never ends well.

Very, very, VERY common in the fields of Suefics and slashfics, especially in fic summaries.

This is not to be confused with Baby, which is a language spoken by the Doctor, or the notorious Angel Sue named Baby.