I just wanted to add that several friends all feel the same way about the halflings in this game. They do not seem to ever breach the "Uncanny Valley." They just never feel real.
"They look like giant-headed baby monsters," is a direct quote about the BG3 models from one of my friends who regularly plays a halfling in tabletop games and I agree with this, too. Currently the squashed proportions of the halfling models make them look like human toddlers wielding swords and bows. They remind me way too much of the World of Warcraft gnomes, rather than a human of smaller proportions.
Another user referenced the halfling art of D&D 3E (referring to how they appear as small, well proportioned humans) and I would like to add that the same art design continued into D&D 4E as well. D&D 5E says that halfling men are "inclined to be stout" (with no reference to halfling women as such), but an inclination is not a definitive. The character of Regis, created by R.A. Salvatore and referenced on Page 26 of the 5E handbook, is described as fat due to his "love of a good meal, or several, as the opportunities presented themselves;" a lifestyle choice rather than as a racial default. Not all halflings are, or should be, fat and pot-bellied.