YBurnMeat ?
Because human is Herbivore

Brain Size, Gestation & Number of Babies
  

Dog Litter Pig Litter


Gestation # ofLifespan



Months BabiesYears

Herbivore
Cow 9 115-20

Herbivore Horse 11 125-30

Herbivore Donkey 11-14 1 27-40

Herbivore Orangutan
9 130-60
Has Big Brain
Herbivore Gorilla 9 135-40
Has Big Brain
HerbivoreLlama11120

HerbivoreZebra11-13120-40

HerbivoreElephant22165
Has Big Brain
Herbi-Omni Chimp 8 115-30

Omnivore Baboon
6
1-2
20-30

Omnivore Pig 4 1015-20

Omnivore Dog 2 5-810-13

Carnivore Lion 4 2-68-16

CarnivoreCat22-613-17

CarnivoreHyena3-41-312

Carnivore Dolphin 12 155-60
Has Big Brain

As shown above, among land mammals over 10 LBs, herbivores have longer gestation (>8 months) and give birth to one baby at a time. 
Omnivores have shorter gestation (<6 months), give birth to multiple babies at once.

Given the complexity of the brain, a longer gestation period of herbivores (9 months) provides more time for brain development of a single baby in the wombEvidence.

Please also see:
Fastest Brain Growth (human baby's brain) on lowest % Protein (Human Breast Milk)

Ray Arjo  FB   5/2023

Based on pictures among apes, the more meat in the diet, the smaller the brain & body.

Among Apes, More Meat in Diet=Smaller Brain