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Background The improvement of sow prolificacy by breeding has increased the number of piglets produced per sow per year. However, intrauterine crowding and/or intrauterine growth restriction typically observed in hyperprolific sows impairs foetal growth which has decreased the average individual birthweight, with a larger proportion of low birthweight (LBW) pigs born per litter with poor gut development and compromised postnatal growth performance. Phytogenic compounds (PC) are plant-derived natural bioactive substances that can be used in livestock production as feed additives to promote animal health and production efficiency. This research aims to study if a specific blend of PC (BPC) supplemented in gestating and lactating hyperprolific sow diets may promote pre- and postnatal maternal effects on performance and oxidative status of sows and their offspring, colostrum-milk features, and piglet gut health-related gene expression and morphology. Forty DanBred hybrid line Landrace x Yorkhire gilts and sows (parities 0–7) were randomly allocated by parity number and body weight into two dietary treatments including unsupplemented Control (n = 20) or Control diets supplemented with 1 g/kg feed of BPC (n = 20) throughout gestation and lactation.Results Several dietary PC from the supplemented BPC were transferred to the placental fluid and milk. The BPC supplementation during gestation enhanced the litter size, antioxidant status, and colostrum protein content of sows. Jejunal histomorphology of neonate piglets, and intestinal-function gene expression related to nutrient transport, antioxidant, innate immune response, and digestion were improved in the BPC group. For both, sows and piglets, plasma antioxidant activity of CAT and SOD enzymes were enhanced. For suckling piglets, jejunal expression of genes related to gut barrier function was improved and piglet weight gain from birth to weaning was enhanced in the BPC group.Conclusions Dietary supplementation of BPC in gestating and lactating diets for hyperprolific sows improves sow’s reproductive performance and colostrum composition, with a significant strength of the antioxidant status of sows and their offspring. The prenatal and postnatal maternal transfer (placental fluid and milk) of BPC to the offspring would influence on the neonatal programming and postnatal of piglet’s gut health, with advantageous effects on piglet’s growth performance.