breastfeeding

CJ
I'm breastfeeding and baby was always fussy around 8pm. (She's 7 weeks old now) Nursing then stopping to cry, latching back on then crying again. Repeatedly. It was like she wasn't getting enough milk or not fast enough or both. Since we figured out that's why she's fussy at night we've been giving her a bottle of breast milk and she's no longer fussy. But, is it normal for my milk to be so low at night? What can I do for it? I have made lactation cookies and they help a lot but don't take care of the night time issue.