It is recommended not to learn "red flower" instruments. It is better to learn some "green leaf" instruments.
Honghua musical instruments refer to the melody instruments in the band. There are too many people learning them. Of course, it will be easier to find a teacher. However, if the children are older, it will be more difficult to take exams or make a living by playing musical instruments. Honghua musical instruments I recommend clarinet and flute. These instruments are relatively simple. Once you learn it, you won’t forget it even if you don’t touch it for a long time. If you don’t practice the trumpet for even a month, the tone and range will shrink, and it is more tiring to play than the first two. Although the saxophone is not bad, there are too many people learning it and the quality of the teachers varies. Furthermore, the saxophone is not made for orchestras (it is made for symphony winds). The first two instruments are relatively easy to play. It is easier to make friends if you join the band, but it is not interesting to play alone.
The green leaf instrument refers to the instrument responsible for harmony or submelody in the band. It is not as brilliant as the former, but it is very good from the perspective of studying and making a living. It’s not that this kind of instrument cannot play melodies, and solos also have their own characteristics. For example, the bassoon has few people to learn, and the melodies are good. Bands are also in short supply. It is easy to study and make a living, but the cost of learning it is very high. The melody played by the tuba trombone may not be as beautiful as other instruments, and it has certain requirements on the player's physical condition. The French horn is an instrument between "red flowers" and "green leaves", and there are relatively few people learning it. The band's status is very important among wind instruments, and it is very popular. The only disadvantage is that it is quite difficult, and it is one of the most difficult to play among wind instruments.
No matter what kind of wind instrument you learn, if possible, you should learn piano for a few years while your child is young, and cultivate your musical literacy during the piano learning process. After that, you can basically master any wind instrument quickly.