The primary objective of this trial is to show that an hypoallergenic infant starter formula containing starch and the probiotic L. reuteri decreases the severity of regurgitation/spitting-up in infants presenting regurgitation/spitting-up , and who have taken it for 4 weeks, in comparison with a standard infant starter formula.

The primary objective of this trial is to show that the test formula (HA formula + starch + L. reuteri) decreases the severity (frequency + volume) of regurgitation/spitting-up in infants and ultrasound gastric emptying time, compared to a classical infant starter formula.

Inclusion Criteria:

• Full term infant (37 weeks ≤ gestation ≤ 42 weeks)
• Age of infant between 5 days and 5 months
• NGA
• Infant exclusively formula-fed at enrollment
• Presenting regurgitation/spitting-up according to the parents' perception
• Vandenplas score of at least 2 and maximum 5
• Having obtained the subject's legal representative's written informed consent

Exclusion Criteria:

• Previous antireflux treatment
• Previous consumption of AR infant formula or external thickener
• Previous consumption of a formula with L. reuteri
• Cow's milk allergy symptoms according to medical decision
• Congenital illness or malformation that may affect growth
• Significant pre-natal and/or post-natal disease
• Newborn whose parents / caregivers cannot be expected to comply with study procedures
• Newborn currently participating or having participated in another clinical trial during the last 4 weeks prior to the beginning of this study.