Healthy children will eat if they are given no other choice. A child of 20 months does not need 4 bottles at night and the only way to break the pattern is not to give it to him. My advice would be to restrict him to 2-3 milk bottles/day in total and to offer him food when you eat. He will start to eat what he is offered if no alternative is available. The same with the sleeping pattern. The only way to break a bad habit is by not providing any incentive for it to continue. We have answered numerous questions on this topic before, which you may refer to.
Children who attend chreche often get recurrent infections e.g. tonsillitis and this is nothing to be too concerned about. After an initial growth spurt children weight often plateau for a while around 18-24 months. This needs to be monitored, but I will not be overly concerned at present if he well in all other respects.
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