There seems to be no pattern with my little one. I am breastfeeding on demand. Sometimes she will go 3/4 hours without feeding and others she will not let go of me for 2 hours. I fed her at 9.30 last night for about an hour, she then woke up at 1.30 in the morning and fed non stop for 2 hours. Every time I tried to put her back in the cot she would start crying. Is there a pattern with your lo or does it really vary??