According to Polish guidelines, children need a daily dose of 600–1000 I·U. vitamin D, which could be skin-synthesized in the period May to September, after at least 15 min solar exposure between 10 am and 3 pm with uncovered forearms and lower legs. In Poland, doctors only prescribe oral supplementation to infants and small children up to 2 years old, rarely for the older children. Numerical estimates of the daily amount of vitamin D (expressed in I.U. vitamin D taken orally) due to the solar exposure for preschoolers have been made on the basis of an observation campaign in Warsaw, Poland. In the period from April to September, the observations of children's clothing of age 4–6 years and the measurements of UV index were carried out in the kindergarten playground and a nearby park (52.31^oN, 21.06°E). It appears, that longer exposures (~45 min) are needed to gain the recommended dose. However, the estimation is burden with large uncertainties. The alternative scenario is to allow children to play outside for as long as possible without getting sunburn, i.e. until the personal erythemal threshold is reached. Then, sunscreens should be applied.

根据波兰指南，儿童每天需要服用600–1000 I·U。维生素D，可以在5月至9月期间由皮肤合成，在上午10点至下午3点之间的太阳照射下至少15分钟，前臂和小腿未露出。在波兰，医生只给2岁以下的婴幼儿开口服补品，很少给大一点的孩子补口。在波兰华沙进行的一项观测活动的基础上，对学龄前儿童由于日光照射所引起的每日维生素D量（以口服IU维生素D表示）进行了数值估算。在4月至9月期间，在幼儿园游乐场和附近的公园中对4-6岁的儿童服装进行了观测并测量了紫外线指数（52.31 ^oN，21.06°E）。似乎需要更长的暴露时间（〜45分钟）才能获得推荐剂量。然而，该估计是具有很大不确定性的负担。另一种情况是允许孩子尽可能长时间在户外玩耍而不会被晒伤，即直到达到个人红斑阈值。然后，应涂防晒霜。