Here's a collection of evidence-based books on the topic of vegan child nutrition. These books were written by experts in vegetarian/vegan nutrition with a background in nutrition science, and they were written for the general public or at least the vegan general public.
Languages are listed alphabetically (English terms). If you know of other books in other languages, please let me know.
Info by the Finnish Vegan Association (Vegaaniliitto)
Vegan baby. A guide to complementary feeding For vegans between the ages of 4 and 12 months (2020) by Christian Koeder (me 😇) Also as a PDF.
Your Complete Vegan Pregnancy. Your All-in-One Guide to a Healthy, Holistic, Plant-Based Pregnancy (2019) by Reed Mangels
Vegaanin ravitsemus [Vegan Nutrition] by Johanna Kaipiainen
Also ... information available online:
Info by the Ministry of Social Affairs and Health (Finland; starting on page 98)
Info by the Finnish Food Authority
Vegane Kinderernährung: Gut versorgt in jeder Altersstufe. Mit über 100 Rezepten (2020) by Edith Gätjen and Markus Keller
Vegan Baby: Vegane Beikost für das Alter 4 bis 12 Monate (2020) by Christian Koeder (me 😇)
Il piatto veg junior. La nuova dieta vegetariana in età pediatrica by Luciana Baroni and Ilaria Fasan
Nutrición para bebés veganos: alimentación complementaria de 4 a 12 meses (2020) by Christian Koeder (me 😇) Also as a PDF.