Maybe this will help, it's from the Weston Price Foundation website:
As a general guideline, we recommend the following doses of vitamin A from cod liver oil, along with a nutrient-dense diet that contains other vitamin A-rich foods:
•Children age 3 months to 12 years: A dose of cod liver oil that provides about 5000 IU vitamin A daily, obtained from about 1 teaspoon of regular cod liver oil or ½ teaspoon of high-vitamin cod liver oil.
•Children over 12 years and adults: A maintenance dose of cod liver oil that provides about 10,000 IU vitamin A daily, obtained from 2 teaspoons of regular cod liver oil or 1 teaspoon of high-vitamin cod liver oil.
•Pregnant and nursing women: A dose of cod liver oil that provides about 20,000 IU vitamin A daily, obtained from 4 teaspoons regular cod liver oil or 2 teaspoons high-vitamin cod liver oil.https://www.westonaprice.org/cod-liver-oil/238.html
So if your CLO is the high vitamin kind, your dosage of 1/4 teaspoon twice a day should be exactly right for the kids
Edit:
I just read on, and there are more recommendations concerning the high-vit. fermented CLO (that's the one I give to my son):
The high-vitamin fermented cod liver oil is sold as a food so does not contain vitamin levels on the label. However, after numerous tests, the approximate values of A and D have been ascertained at 1900 IU vitamin A per mL and 390 IU vitamin D per mL. Thus 1 teaspoon of high-vitamin fermented cod liver oil contains 9500 IU vitamin A and 1950 IU vitamin D, a ratio of about 5:1.
Based on these values, the dosage for the high-vitamin fermented cod liver oil is provided as follows:
•Children age 3 months to 12 years: 1/2 teaspoon or 2.5 mL, providing 4650 IU vitamin A and 975 IU vitamin D.
•Children over 12 years and adults: 1 teaspoon or 10 capsules, providing 9500 IU vitamin A and 1950 IU vitamin D.
•Pregnant and nursing women: 2 teaspoon or 20 capsules, providing 19,000 IU vitamin A and 3900 IU vitamin D.
So even with that, the 1/2 teaspoon is still correct. I've been giving about 2 ml daily (just one dose), so apparently I'm not giving quite enough, since they recommend 2.5 ml.....
