my baby became too clingy all of a sudden and cries out loud whenever my wife puts her on mat. Why is that?

I’m guessing that your baby has gotten used to being held constantly by your wife. Here are some suggestions you can consider: - cuddle your baby till she is so sleepy that she is unable to protest when being laid onto the mat - use colourful toys suitable for infants to keep her occupied when being placed onto the mat In general, your wife may have to learn to say “no” to baby. Try having another caregiver look after your baby at times so that she will not be too clingy to your wife. However, I’m not too sure if this is really the issue. You can have a read at this article to see if the description fits your baby: http://www.newkidscenter.com/Baby-Cries-When-Not-Held.html