In this review of The Wheel of Time tv series, the reviewer, Lucy Mangan, writes:
There is also Nynaeve (Zoë Robins) – a Wisdom who, despite looking like a zygote, seems to be a protective village elder.
Googling on it, I don't get a lot of hits except for the literal explanation of what a zygote is. What does "looking like a zygote" mean in this context? Is it a common idiom?