Which among the following is not a form of pre-speech communication?

Language development in infants progresses through various stages before they start forming actual sentences.

 Key Points

• Pre-speech communication includes nonverbal and early vocal expressions that help babies interact with their surroundings.
• These early forms of communication lay the foundation for language acquisition and social interaction.
• Pre-speech communication includes crying, cooing, babbling, and gestures, which are the earliest ways infants express their needs and emotions..
• Sentence formation is not a form of pre-speech communication because it occurs at a later stage of language development.
• In contrast, sentence formation requires a developed vocabulary, grammar understanding, and cognitive skills, which emerge much later, typically after the first year of life. 

Hence, the correct answer is sentence formation.