@MelGibsonafter4Beers @Honkers Young Alexei was reportedly "very healthy and full of energy" in his early trips to Germany with his father, according to the German court with whom Alexei spent his time while the Czar and the Kaiser met each other.
He was often tagging along his father in his trips, particularly in Germany, but also in Denmark and Bulgaria.
That is absolutely unlikely for a sick-from-birth kid.

Rumors suggest that he has been poisoned (injected, according to post-war German and Russian narratives) by his tutor, at around 8 years, by a french-swiss named pierre Gilliard, at a point many speculated that the swiss was in fact a francophone jew.
According to the period and the White's Guard, Gillard attempted to play both sides and ended up captured, but was later on allowed to go his way by the reds, for undisclosed motives.