To be honest, this time everything looks confusing. With my son, I breastfed until he was a year and…

To be honest, this time everything looks confusing. With my son, I breastfed until he was a year and three months old, and there were hardly any questions, but with this little one, it's all problems. Let's start with the fact that she's gaining more than enough weight. At four months, she weighed 8 kg. But during the day, she acts like she's starving: she eats for five minutes and then throws it all away, and immediately asks for more again. I hold the second breast—it gets easier—but an hour later she's crying again, as if hungry, and starts nursing once more. At first, I thought she was just calming down, but I started noticing that her diaper is almost dry after four hours during the day. In other words, she pees literally only once a day. In general, I think we should weigh her and see how much she's gained in the last 10 days. And if the gain is small, does only the pediatrician decide on supplementary feeding? Or has anyone introduced it themselves, maybe adding formula during the day? At night, she often lingers at the breast and seems to only get full then, since milk is produced better at night. But during the day, the breast works stiffly: the baby nurses for a couple of minutes and then just hangs there, barely swallowing at all. Why is this happening? I drink plenty of water.