Is there such thing as over feeding? My 9 day old daughter is combo fed she had 3oz bottles every 3 hours and breastfed for comfort or if she's fussing for more, she's old 9 days old and cleared 5oz in one feed today, she struggles to latch onto the dummy to keep her calm in between feeds and just gets frustrated with it, if you hold of on the feed she gets very upset, she's gets milk on demand witch is fine but will over feeding cause any issues or is it safe? (She doesn't throw any milk back up)