Two new sources that I have come across recently. One, The Journal of the International Society for the History of Islamic Medicine may be on hiatus, but some of the articles are very interesting in terms of both Natural History and the Sciences of Life, with articles such as "Balneology: A Concept of Public Health –Bath Houses in Arabian Life" Vol.5 , No.9 - April 2006. Arish M.K. Serwani, Mashkoor Ahmed, et al.
The other is an archive of French books and materials on phrenology and degeneracy.
Cite - Scientifica: Bibliothèque Histoire des sciences has a great collection on both subjects, as well as 19th century advice on infant and child behavior.