Also by Googling I found this
"Canon 856 of the Code of Canon Law says that baptisms should ordinarily be done on Sundays or, if possible, at the Easter Vigil. "
Not only is this a reference to the Catholic code, as already noted; it is also a reference to the revised Code of Canon Law promulgated in January 1983, so just a tad anachronistic.
My concordance of canons between the 1983 and 1917 codes offers no equivalent in the 1917 code, which was a codification of the then existing canon law.
As it happens, I have a copy of Gibson's Codex Anglicani of 1713 on the shelf in my study. It leads on the subject of Baptism with Article xxvii of the 39 Articles, and then continues (on page 435 of volume 1) with Canon lxviii of the Canons of 1603 (1604 in the Province of York):
lxviii. Ministers not to refuse to Christen or Bury.
No Minister shall refuse or delay to Christen any Child according to the Form of the Book of Common-Prayer, that is brought to the Church to him upon Sundays or Holydays to be Christened, or to Bury any Corps that is brought to the Church or Church-Yard (convenient Warning being given him thereof before) in such manner and Form as is prescribed in the said Book of Common Prayer. And if he shall refuse to Christen the one, or Bury the other, except the party deceased were denounced Excommunicated
Majori Excommunicatione, for some grievous and notorious Crime, (and no man able to testifie of his Repentance) he shall be suspended by the Bishop of the Diocese from his Ministry by the space of three Months.
Nothing there, then, about withholding the sacrament during Lent.
The rubric to the service for the Publick Baptism of Infants in the Book of Common Prayer reads as follows:
Due notice, normally of at least a week, shall be given before a child is brought to the church to be baptized. ... No minister shall refuse or, save for the purpose of preparing or instructing the parents or guardians or godparents, delay to baptize any infant within his cure that is brought to the church to be baptized, providing that due notice has been given and the provisions relating to godparents are observed. If the minister shall refuse or unduly delay to baptize any such infant, the parents or guardians may apply to the bishop of the diocese who shall, after consultation with the minister, give such directions as he thinks fit.
The minister, before proceeding to the Baptism, shall have satisfied himself that the child presented to him has not already been baptized.
So nothing there about not baptizing in Lent, either.
In Chapter III of the title Baptism ("The Times of Publick Baptism") Gibson first offers a constitution of Otho of 1237, the full text of which is in Latin, the English marginal note to which reads "The Feasts of Easter and Whitsuntide, being the two Solemn times of Baptizing, the People shall be exhorted to bring their Children to be baptized accordingly".
So this constitution creates a preference for Easter or Whitsun baptisms, but no obligation, and certainly no prohibition on baptism in Lent.
[continues in next post]