For the last week or so, i have been giving my 17 week old DD 1 bottle of formula a day, always the same one at around 7pm in the evening. Up until then she was EBF. She normally poos every 1-2 days but i have noticed that since we introduced the bottle (Aptamil), she is struggling to poo. She hasn't pooed for 4 days now and she keeps straining and trying to but nothing is happening. This is the same situation as we had at the start of last week as well. When her poo comes, it looks normal, i.e. not log like. We have been doing the cycling legs thing (which she thinks is great fun!) but to no avail. She has never had water.
Is this a normal situation? How long will it take her tummy to get used to the change? What else can i do to help her? She seems uncomfortable and frustrated! Please help a beautiful baby girl!