Hi Loula,

I remember having this question and worry with my 1st 2 pregnancies and from what I have read it is quite normal and just another thing for us to worry about, but quite normal.

I think they just get in to different positions and placenta takes up a bit of space and sometimes we're not as 'switched' on to the movements at different times of the day and might not notice something that could still pass as wind.

Hope I was helpful..