Three programs were written for the computer.
The first, consisting of 17 instructions, was written by Kilburn, and so far as can be ascertained first ran on 21 June 1948.
It was designed to find the highest proper factor of 2¹⁸ (262,144) by trying every integer from 2¹⁸ − 1 downwards.
The divisions were implemented by repeated subtractions of the divisor.
The Baby took 3.5 million operations and 52 minutes to produce the answer (131,072).
The program used eight words of working storage in addition to its 17 words of instructions, giving a program size of 25 words.

Geoff Tootill wrote an amended version of the program the following month, and in mid-July Alan Turing — who had been appointed as a reader in the mathematics department at Manchester University in September 1948 — submitted the third program, to carry out long division.
Turing had by then been appointed to the nominal post of Deputy Director of the Computing Machine Laboratory at the university, although the laboratory did not become a physical reality until 1951.
Three programs were written for the computer. The first, consisting of 17 instructions, was written by Kilburn, and so far as can be ascertained first ran on 21 June 1948. It was designed to find the highest proper factor of 2¹⁸ (262,144) by trying every integer from 2¹⁸ − 1 downwards. The divisions were implemented by repeated subtractions of the divisor. The Baby took 3.5 million operations and 52 minutes to produce the answer (131,072). The program used eight words of working storage in addition to its 17 words of instructions, giving a program size of 25 words.
Geoff Tootill wrote an amended version of the program the following month, and in mid-July Alan Turing — who had been appointed as a reader in the mathematics department at Manchester University in September 1948 — submitted the third program, to carry out long division. Turing had by then been appointed to the nominal post of Deputy Director of the Computing Machine Laboratory at the university, although the laboratory did not become a physical reality until 1951.
Manchester Baby