Management of Grass Ingestion in an 8-Month-Old with Nausea and Vomiting
For an 8-month-old who ingested grass and is experiencing nausea and vomiting with no visible foreign material, begin with a focused clinical assessment to determine if this is benign gastric irritation versus a more serious obstruction, then provide supportive care with close observation—most cases will be self-limited and benign. 1
Initial Clinical Assessment
The diagnostic workup should start with a thorough clinical evaluation, as history and physical examination lead to the diagnosis in most instances 1. Specifically assess for:
- Character of vomiting: Is it bilious (green) or nonbilious? Bilious emesis suggests obstruction distal to the ampulla of Vater and requires urgent evaluation 1
- Frequency and forcefulness: Repeated forceful vomiting should be evaluated for underlying obstruction 1
- Hydration status: Check vital signs, mucous membranes, skin turgor, and urine output
- Abdominal examination: Look for distension, tenderness, palpable masses, or signs of obstruction
- Weight gain pattern: Infants with normal weight gain and no other symptoms tend not to have obstruction as the cause 1
- Red flags: Unstable vital signs, bile or blood in vomitus, features of GI obstruction, or altered mental status 2
Management Algorithm
If Nonbilious Vomiting with Normal Exam:
This is the most likely scenario for grass ingestion and represents benign gastric irritation. Vomiting is common in infants and in the majority of cases is benign 1. The grass likely caused mechanical irritation of the gastric mucosa.
- Provide supportive care: Small, frequent feeds; maintain hydration
- Observe closely: Most cases are self-limiting 2
- Consider antiemetics if persistent: Domperidone or ondansetron may be used if vomiting is persistent and impedes oral intake 2
- Parental reassurance: Since most causes are benign, reassurance with or without symptomatic treatment may suffice 2
If Bilious Vomiting or Concerning Features:
This requires urgent evaluation. Bilious emesis or repeated forceful vomiting should be evaluated for underlying obstruction 1.
- Obtain abdominal X-ray immediately: Signs of GI obstruction should prompt an abdominal X-ray and surgical consultation 2
- Consider foreign body: While grass itself is unlikely to cause obstruction, foreign body ingestion should always be suspected in young patients 3
- Surgical consultation: If imaging suggests obstruction
Key Clinical Pitfalls
Do not assume all vomiting in infants is benign gastroesophageal reflux. While GER is the most common cause, particularly in the first weeks of life 1, you must actively exclude more serious pathology through focused assessment.
Maintain a high index of suspicion for foreign body ingestion. An 8-month-old exploring their environment may have ingested other objects along with grass 3. If symptoms persist beyond 24-48 hours or worsen, consider endoscopy.
Do not delay evaluation if red flags are present. The differential for vomiting in this age group includes serious conditions: intussusception (though unusual before 3 months), malrotation with volvulus (can present at any age), gastric volvulus, and foreign body obstruction 1.
When to Escalate Care
- Vomiting persists beyond 24-48 hours
- Development of bilious vomiting
- Signs of dehydration despite oral rehydration attempts
- Abdominal distension or severe pain
- Bloody stools or hematemesis
- Altered mental status or lethargy
If the cause is not apparent after initial assessment, observation and/or admission would be appropriate 2. Mere symptomatic treatment may delay specific diagnosis and therapy if a more serious condition is present.