High Protein Baby Cereal was discontinued over 10 years ago here in the US. Not much need to debate its nutrients now.
I do however have the 1985 edition of Bowes and Church's Food Values of Portions Commonly Used.
High Protein Baby Cereal had 0.9 g protein, 17 mg calcium, 15 mg phosphorus and 1.77 mg iron in a 1 TBS portion. (other baby cereals at that time had 0.3 g protein in 1 TBS)
Mixed Baby Cereal currently has 0.46 g protein, 27.4 mg calcium, 14.07 mg phosphorus and 1.78 mg iron in a 1 TBS portion
for comparison purposes
Wombaroo High Protein supplement has 5.2 g protein, 130 mg calcium, 90 mg phosphorus and 0.8 mg iron in 1 TBS.