Bella is a grown woman who, when we first meet her, behaves like a toddler.
Baxter has no idea whose body this once was; he doesnt care although tiny spoiler!
Max is also something of a naif.

Ramy Youssef and Emma Stone in ‘Poor Things’Searchlight
Bellas childish desires are constantly expanding, however.
She does need to go outside.
She wants to see the world.

More than that, once she discovers the pleasure zone between her legs, she wants sex.
From this point,Poor Thingsbecomes the picaresque tale of Bellas journeys.
Toddler tactics can be useful.
Maybe she doesnt want to do furious jumping all the time, after all.
Ideas are banging in Bellas head like lights in a storm!
she announces when Wedderburn lurches into frame to summon her to bed.
What a glorious paean to freedom it is.