Nestlé has recalled some types of its baby food product in the US and Canada after the discovery of plastic residue.

The Swiss food giant said that it was recalling products made in Puerto Rico between October and February following the discovery of plastic pieces that may be small enough to be ingested by infants.

Nestlé, one of the world’s largest food manufacturers, said there had been “no confirmed reports of injuries related to this issue”. The products affected by the recall include Sara Lee brand baby food pots with a use-by date of December 22 and 44, and baby food containers with a March 2 and 27 use-by date.

Nestlé sold its US baby food subsidiary, Gerber, to industry giant Wal-Mart in 2014 for $3.3bn. Gerber’s healthy eating baby food products include food that offers vitamin B12 and iron as well as sodium benzoate, a preservative.

The Swiss food and drink group is facing pressure in Switzerland from activist shareholder Daniel Berndt, who represents the Swiss Financial Market Supervisory Authority on the board of Nestlé. He has been critical of the company’s development of a loss-making US cold brew coffee business and its offer to buy back shares.

Delfin Martinez, head of the Nestlé Nutrition Group, said: “We apologise for any inconvenience and inconvenience this may cause and hope to resume the supply of our infant formula products as soon as possible.”

The recall includes Nestlé Aubergine and Aubergine Strips produced in Puerto Rico since October and packaged with the use-by dates of February 12 and March 2, according to the company.

The Chinese retail chain – Sun Art – is the largest retail vendor of Gerber baby food, and said it was actively managing the supply chain to ensure it was in full supply with the affected product.