Hi there. By itself these antibiotics should not be the cause for the increasing grey hairs. Most often, this process is genetically dictated. It just may be that post partum, you lost a lot of 'sleeping' black hair (those that were in a dormant or latent phase) & as a result, the whites show up more. Relax. Diet rich in essential minerals & silica et al (depending on your food habbits) may help you in the long run. Go see a good dermatologist
in your area as the treatment will require a human touch. I would be glad to recommend one in your area should you choose to seek my help. Cheers & Good luck!
Dr Praveen Roidrigues Dermatologist & Cosmetologist, Vikram Hospital, Bangalore, India