Put it at the punchline of a short reaction edit, right after the setup shows the babyish behaviour, then follow it with the baby laughing meme for a second beat before cutting away. Keep it as the only baby gag in the edit, and save a goofy ahh sound for a later gag so the two jokes do not compete.
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This short clip is a playful run of baby-style babbling, repeating goo goo gaa gaa in a soft, high-pitched voice for just over four seconds. It feels silly and lighthearted, like a grown-up joke delivered in a baby's voice, and it lands best as a quick, harmless tease rather than a serious sound.