The short answer for a milk snake at each stage
A young milk snake needs frequent small meals, an adult milk snake needs a larger mouse less often, and a senior milk snake usually needs that meal stretched further apart. The prey item should roughly match the thickest part of the snake's body, never dwarf it, and the interval matters as much as the size. Growing youngsters burn food into length, settled adults burn it into condition, and older snakes move less and add fat more easily. Treat the calendar as a starting guide, then let body shape, shed quality, and steady weights refine it for this individual snake.
Young milk snakes: small prey, short gaps
A young milk snake is building bone, muscle, and length quickly, so it is offered a pinky mouse every five to six days. The meal leaves only a modest bulge that fades within a day or two; a bulge that lingers or looks strained means the prey was too large. As the juvenile grows, move first to fuzzies and then to hopper mice, changing the prey size before you shorten the interval. Offer food in the evening, when this naturally secretive snake is more willing to emerge, and leave a refused meal out of the enclosure rather than reoffering it repeatedly that same night.
Adult milk snakes: one right-sized mouse, wider spacing
An adult milk snake that has reached its mature length usually takes one adult mouse every seven to ten days. At this stage extra food no longer becomes useful growth, so a snake fed on a juvenile rhythm will quietly round out, with fat deposits along the rear body and a soft look over the ribs. Keep the prey matched to body width, keep fresh water available after every feed, and avoid handling for a couple of days while digestion is underway. If the adult skips a meal around a shed, note the shed date and offer again on the next regular day instead of chasing it daily.
Senior milk snakes: protect condition without piling on fat
A senior milk snake is slower, spends more time in its hide, and converts surplus food to fat rather than activity. Most seniors do well on a slightly smaller mouse every ten to fourteen days, adjusted by weight trend rather than appetite alone, because many older milk snakes will strike eagerly at food they do not need. Watch for laboured movement, a body that looks triangular when underweight or blunt and sausage-like when overweight, and incomplete sheds that can signal broader husbandry drift. A senior that stops eating entirely, loses visible weight, or develops mouth or breathing changes needs a reptile vet promptly rather than a bigger meal.
Adjusting at each transition
Change a milk snake's plan gradually when you adjust at each stage: step the prey size up only after several successful feeds at the current size, and lengthen the gap by a day or two at a time. Weigh on the same scale, on a non-feeding day, and record prey type, date, shed, and any refusal together, because a pattern across six feeds explains far more than one enthusiastic or missed meal. Recheck warm-side temperatures whenever appetite changes, since a cool milk snake digests slowly at any age. In KinsLe, Care Teams lets you hand the weighing, feeding, and shed checks for this milk snake to different family members as distinct tasks, each marked complete with a timestamp when it is done.