How to create more than 1 child process with a loop?

Question

How can I create an efficient loop that lets 2 child processes work with 2 different files?

I tried using a loop like:

for(i = 0; i < 2; i++){
    if((pids[i] = fork()) < 0){
        fprintf(stderr, "Something wrong happened creating child n:%d\n", i+1);
        exit(EXIT_FAILURE);
    }
    if(pids[i] == 0){
        sprintf(nomefile, "file_figlio_%d.txt", i+1);
        fd[i] = open(nomefile, O_CREAT | O_TRUNC | O_WRONLY, 0660);
        printf("Write on the file n:%d\n", i);
        fgets(buffer, sizeof(buffer), stdin);
        write(fd[i], buffer, strlen(buffer));
        close(fd[i]);
        exit(EXIT_SUCCESS);
    }
}

The output is going to be:

./7afebb
HELLO 1
Write on the file n:1
HELLO 0
Write on the file n:0
(empty space to fill file 1)
(empty space to fill file 2)

How can I make it ask me to fill file 1 and only after that fill file 2?

// This is how i corrected the code:

void sig_handler(int sig){
    printf("SIGNAL RECEIVED: %d\n", sig);
    return;
}

for(i = 0; i < n;i++){
        if((pid[i] = fork()) < 0){
            fprintf(stderr, "Something went wrong\n");
            exit(EXIT_FAILURE);
        }
        if(pid[i] == 0){
            pause();
            sprintf(nomefile, "figlio_mag%d.txt", i+1);
            fd[i] = open(nomefile, O_CREAT | O_WRONLY | O_TRUNC, 0660);
            printf("Write on the file:\n");
            fgets(buffer, sizeof(buffer), stdin);
            write(fd[i], buffer, strlen(buffer));
            close(fd[i]);
            exit(EXIT_SUCCESS);
        }
} 
action.sa_handler = SIG_DFL;
for(i = 0; i < n; i++){
    printf("PARENT: Click enter to write on file n:%d\n", i);
    getchar();
    kill(pid[i], SIGUSR1);
    wait(0);
}