Still, ask for the bassinet as you can sit the baby there to feed him baby food if required.
空姐s are very willing to keep an eye on/hold your baby if you need to go to toilet or you are too tired to hold your crying baby for too long, especially when you are travelling alone.
Also, you might want to order a special meal (such as vegetarian, no beef) so that they can serve you meals earlier. Then you can make use of the time when all people are eating to use the toilet without queuing.