So my LO is 6 weeks 5 days old I started her on Aptamil 1st milk but she was getting really constipated 3 days ago I changed her to Aptamil Comfort milk as recommended by my HV her pops have changed to a more runny dark green colour with a foul smell and as of last night she's started being quite sick. Has anyone else had this when switching milk ? Should o change milk or will these symptoms (the sickness especially) wear off as her digestive system adapts ? Thanks in advance