This has been happening for the last couple of weeks, at least once a day. She's crying for whatever reason (hunger, nappy, wind), and if we're not quick enough to deal with it, she cries so hard that she expels all the air from her lungs and stops breathing for around 3-4 seconds, and goes nearly purple. It scared the life out of us the first time. We pick her up, pat her etc, and she recovers instantly and carries on crying.
We're not intentionally leaving her to cry, these are just times when for example I'm not quick enough getting a boob out, or when we just give her a couple of minutes to see if she can settle without feeding.
Is this normal?