She did end up weaning her second son because of D - MER (she hadn't yet learned what it was), but successfully breastfed her third and fourth sons into the toddler years despite the D - MER being just as intense with them in the early months (it continued to some extent throughout her nursing experience, but was more bearable as time went on). (scarymommy.com)
His fourth son was Judah (Yehudah), from the root word that means «praise.» (religion.blogs.cnn.com)
Thus he gained the support and the protection from John of Gaunt who was the fourth son of Edward III and became the most powerful man in the kingdom. (religion-online.org)