Sorry to chime in so late. What the evidence shows, but the ents in Spain (as 
well as in Italy ) seem not realizing, is that otosclerosis worsens in pregnancy -
whereas the lactation causality link is far from being proved. See:
Gristwood RD, Venables WN. Pregnancy and otosclerosis. Clin Otorinolaryngol 
1983; 8(3):205-10.
Best
Silia Armeni 
pediatrician, ibclc (Rome, Italy)

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