Ok, I try a smaller bottle tomorrow morning.
Wrt short naps, I think he needs to sleep more than half an hour. Today he has slept only 30m chunks the whole day and he was so tired that he has screamed the whole afternoon. Unfortunately when he's so tired he cries a lot and it is increasingly difficult to put him to sleep. Put him to sleep in the crib is a nightmare but also using stroller does not guarantee a success.
Sadly tomorrow will be a bad day because I have things to do both in the morning and in the afternoon, so I cannot put him to sleep in his crib even for his first nap... I hate this. I try to ask my mother to put him to sleep in the crib he has at my mother's house, but she is not enough committed to make him sleep. "he cries when in the crib, he does not want to sleep; looo, he's smiling" she always says. And then she wonders that half an hour later he screams a lot.