Moonstorm - If your DS doesn't get treated you could end up in a cycle of thrush, treat, thrush, treat. However the young age of your DS does make prescribing things tricky (see below) which is why your GP hasn't given him anything.
I had nipple thrush whilst tandem nursing and even though only DD2 and myself showed signs of it DD1 was also treated - she only had one lot of Nystatin though as she had an allergic reaction to a flavouring in it - luckily she was given some Medised (for other reasons) with it as well which stopped the allergic reaction being too severe (she had arthritic urticaria where all her joints swelled up).
I was only prescribed 1 fluconazole tablet when I had ductal thrush though as my GP didn't even believe the BfN leaflet I brought along to show her what to prescribe
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I'm a bfing peer supporter and we have recently been given a 'Breastfeeding Problems & Solutions Professionals Guide' leaflet (NHS) and this is what it has to say re Ductal Candidiasis treatment:-
Mother : Miconazole cream 2% small amount applied to nipple area after each feed
Neonates - No current licensed product availible however Community Practioner Nurse Prescibers may exceptionally prescribe Nystatin suspension to neonates where they are absolutely clear the diagnosis is on of oral thrush at the dose recommended in the Children's BNF. Nurse Prescribers must be clear that they accept clinical and medico-legal responsibility for prescribing and must prescribe with in their own competence.
Clotrimazole cream 1% x 3 times daily to baby's nappy area
Change breast pads after every feed.
Steam sterilise all feeding equipment or boil for 20 mins (cold water sterilisation is not as effective against candida)
Hot wash all clothing in contact with breast
Use treatment for a full week after symptoms have gone - may take 4 weeks to clear.
N.B. Many mothers experience deep breast pain which resolves with topical treatment however if the above course of treatment fails, oral Fluconazole may be indicated. Fluconazole is not licensed for use in breastfeeding, however it is excreted into breast milk in amounts less than the does recommended for treatment of neonatal mucosal candidiasis.
Health professionals can refer to www.breastfeedingnetwork.org.uk/thrush-and-breastfeeding.html for further information on treatment with Fluconazole.
Hopefully the 10 day course will provide enough fluconazole through your milk to kill off any lurking candida before your DS is colonised with them.