Augmentation mammoplasty is the most frequent request among esthetic surgery procedures but numerous controversies have been raised about the security of the silicone gel prostheses. Today a new question needs an answer: is the prosthesis a risk factor for pregnancy? In this paper the results of a hematochemical study performed on a group of patients with term pregnancies and silicone gel breast implants (group A) compared with a control group without implants (B) are described. For laboratory screening the valuation of antibody (TRIM) and silicone concentrations in blood and maternal milk and in neonate blood was performed.