Some questions about period
Some breastfeeding mothers resume their menstrual cycle sooner than 11 weeks and others after 24 months or more. It's all related to hormones and the differences in mothers and babies' breastfeeding styles. In your case, since you have introduced solid food, the stimulation to the breast is decreased, especially at night, menstruation is likely to return soon after.
The return of menstruation does not mean the end of breastfeeding. The milk does not sour or "go bad" when you are having a period. The milk is no less nutritious when you are menstruating than when you are not. Some women do notice a temporary drop in milk supply in the days just prior to a period and for a few days into one. This is due to hormonal fluctuations. Once the period begins and hormone levels begin to return to normal, the milk supply will boost back up again. Most babies can compensate well for this temporary drop in supply with more frequent nursing.
If you baby can't settle at the breast, then try other comfort measures, play some music (try different styles and types of voices to see which baby prefers), or sing to baby.
Sometimes change of pace work well too, i.e. rock baby, hold baby and gently bounce, sway back and forth or dance, put baby in a sling or baby carrier and walk around inside or outside.
Just keep up the good work. 
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My baby is being exclusively breastfed from the date of birth till now 9.5 months. Around 6 months, we introduced solid food to her. Today,my mood got frustrated very easily, and found my period just started again. People said the first 2 or 3 days of period does affect the taste of our milk, is that true? My baby is very fussy today, I even can't settle her after breastfed. Will the condition improve later?
Besides, I really hope my baby can have more breastmilk(especially the first year), and I hope I can continue to breastfeed her till she doesn't want to. But does the sign of my period implies she doesn't have enough milk? Will she likes solid food more than having milk?