It is common for baby to experience changes in the patterns of their bowel movements when solids are introduced. Some may have more frequent bowel movements, while others (like your baby) may decrease.
Here are some signs that you can look out for which may indicate that your baby may be having constipation:
- Hard, compact, infrequent stools.
- Pain during pooping. One sign would be if your baby cries in pain as she poops, that might mean he/she is constipated.
- Streaks of blood in or on the poop.
You can refer to this article for more information on how to handle a baby with constipation:
http://www.startbabyonsolids.com/baby-solid-foods-reactions/handling-baby-constipation/
In general, you can try including more fiber rich food (prunes/plums and pears seemed to be good for easing constipation). Also, increasing your baby's fluid intake (breast milk, diluted juices or water) may help.