I am taking flucloxacillin to treat mastitis. I started on 250mg four times a day (with no obvious side-effects in baby) but was increased to 500mg four times a day as was still getting feverish after 48 hours. I started this higher does 24 hours ago and my little girl has been very unsettled all day. This is a very unusual pattern (she's 12 days old). She's feeding well, wet + dirty nappies, no temperature but won't settle as usual after a feed and is crying off and on until the next feed. Has anyone else experienced an unsettled baby while using antibiotics with mastitis?