Slight headaches during or after breast feeding. Is it normal?

Headaches. Some of the hormone changes, particularly for estrogen, may be a factor. Headaches and migraines in particular may appear or worsen after giving birth. Sleep deprivation is a well-known and powerful trigger for migraines. Stress is another often underestimated trigger. Dehydration and allergies may also be a factor.
Oxytocin release. This is a natural hormone which is released from your brain upon stimulation such as nipple sucking during breast feeding. It is neuronally medicated..I.E.Baby sucking on your nipple causes the release of this hormone which allows the milk-let-down for the baby to drink. This may be the cause of your slight headache. Keep well hydrated, and relax while breastfeeding. If worsen, call your doc...