This app was mentioned in 5 comments, with an average of 6.60 upvotes
This situation is my nightmare as well! I can highly recommend the Baby and Child First Aid app (in Google Play Store by the British Red Cross.
Apart from teaching the basics of Baby First Aid, it also functions as an quick reference guide which tells you the first steps to take in any emergency.
I took the baby first aid classroom course that the British Red Cross offer (also recommended if you're in the UK), and the app is great at reinforcing the knowledge. You never know when you need it!
2 amazing apps I am fortunate not to have had to use yet
Baby and child first aid - https://play.google.com/store/apps/details?id=com.cube.rca.bcfa
St John Ambulance First Aid - https://play.google.com/store/apps/details?id=com.sja.firstaid
Installed the baby and child app to, hopefully I will never need to use these.
https://play.google.com/store/apps/details?id=com.cube.rca.bcfa
This First Aid app (from British Red Cross) has great text and videos, and even tests your knowledge: https://play.google.com/store/apps/details?id=com.cube.rca.bcfa