Energy needs barely change in early gestation, climb through the middle and late weeks as fetuses grow, and may dip just before birth from uterine pressure, which is normal.
The common approach is a gradual switch to kitten or growth formula after confirmation, with higher protein, fat, and mineral density, fed free-choice or in extra meals.
Avoid ad-hoc calcium supplements during pregnancy, since imbalance raises eclampsia risk afterward; clear any supplement with the vet first.
Do not improvise dewormers or vaccines while pregnant; verify drug safety first and agree on an emergency route with your vet for abnormal labor signs.
